diff --git a/ebook_converter/customize/builtins.py b/ebook_converter/customize/builtins.py
index b824879..16f9a46 100644
--- a/ebook_converter/customize/builtins.py
+++ b/ebook_converter/customize/builtins.py
@@ -1102,277 +1102,277 @@ plugins += [ActionAdd, ActionFetchAnnotations, ActionGenerateCatalog,
 # Preferences Plugins {{{
 
 
-class LookAndFeel(PreferencesPlugin):
-    name = 'Look & Feel'
-    icon = I('lookfeel.png')
-    gui_name = _('Look & feel')
-    category = 'Interface'
-    gui_category = _('Interface')
-    category_order = 1
-    name_order = 1
-    config_widget = 'ebook_converter.gui2.preferences.look_feel'
-    description = _('Adjust the look and feel of the calibre interface'
-            ' to suit your tastes')
+# class LookAndFeel(PreferencesPlugin):
+    # name = 'Look & Feel'
+    # icon = I('lookfeel.png')
+    # gui_name = _('Look & feel')
+    # category = 'Interface'
+    # gui_category = _('Interface')
+    # category_order = 1
+    # name_order = 1
+    # config_widget = 'ebook_converter.gui2.preferences.look_feel'
+    # description = _('Adjust the look and feel of the calibre interface'
+            # ' to suit your tastes')
 
 
-class Behavior(PreferencesPlugin):
-    name = 'Behavior'
-    icon = I('config.png')
-    gui_name = _('Behavior')
-    category = 'Interface'
-    gui_category = _('Interface')
-    category_order = 1
-    name_order = 2
-    config_widget = 'ebook_converter.gui2.preferences.behavior'
-    description = _('Change the way calibre behaves')
+# class Behavior(PreferencesPlugin):
+    # name = 'Behavior'
+    # icon = I('config.png')
+    # gui_name = _('Behavior')
+    # category = 'Interface'
+    # gui_category = _('Interface')
+    # category_order = 1
+    # name_order = 2
+    # config_widget = 'ebook_converter.gui2.preferences.behavior'
+    # description = _('Change the way calibre behaves')
 
 
-class Columns(PreferencesPlugin):
-    name = 'Custom Columns'
-    icon = I('column.png')
-    gui_name = _('Add your own columns')
-    category = 'Interface'
-    gui_category = _('Interface')
-    category_order = 1
-    name_order = 3
-    config_widget = 'ebook_converter.gui2.preferences.columns'
-    description = _('Add/remove your own columns to the calibre book list')
+# class Columns(PreferencesPlugin):
+    # name = 'Custom Columns'
+    # icon = I('column.png')
+    # gui_name = _('Add your own columns')
+    # category = 'Interface'
+    # gui_category = _('Interface')
+    # category_order = 1
+    # name_order = 3
+    # config_widget = 'ebook_converter.gui2.preferences.columns'
+    # description = _('Add/remove your own columns to the calibre book list')
 
 
-class Toolbar(PreferencesPlugin):
-    name = 'Toolbar'
-    icon = I('wizard.png')
-    gui_name = _('Toolbars & menus')
-    category = 'Interface'
-    gui_category = _('Interface')
-    category_order = 1
-    name_order = 4
-    config_widget = 'ebook_converter.gui2.preferences.toolbar'
-    description = _('Customize the toolbars and context menus, changing which'
-            ' actions are available in each')
+# class Toolbar(PreferencesPlugin):
+    # name = 'Toolbar'
+    # icon = I('wizard.png')
+    # gui_name = _('Toolbars & menus')
+    # category = 'Interface'
+    # gui_category = _('Interface')
+    # category_order = 1
+    # name_order = 4
+    # config_widget = 'ebook_converter.gui2.preferences.toolbar'
+    # description = _('Customize the toolbars and context menus, changing which'
+            # ' actions are available in each')
 
 
-class Search(PreferencesPlugin):
-    name = 'Search'
-    icon = I('search.png')
-    gui_name = _('Searching')
-    category = 'Interface'
-    gui_category = _('Interface')
-    category_order = 1
-    name_order = 5
-    config_widget = 'ebook_converter.gui2.preferences.search'
-    description = _('Customize the way searching for books works in calibre')
+# class Search(PreferencesPlugin):
+    # name = 'Search'
+    # icon = I('search.png')
+    # gui_name = _('Searching')
+    # category = 'Interface'
+    # gui_category = _('Interface')
+    # category_order = 1
+    # name_order = 5
+    # config_widget = 'ebook_converter.gui2.preferences.search'
+    # description = _('Customize the way searching for books works in calibre')
 
 
-class InputOptions(PreferencesPlugin):
-    name = 'Input Options'
-    icon = I('arrow-down.png')
-    gui_name = _('Input options')
-    category = 'Conversion'
-    gui_category = _('Conversion')
-    category_order = 2
-    name_order = 1
-    config_widget = 'ebook_converter.gui2.preferences.conversion:InputOptions'
-    description = _('Set conversion options specific to each input format')
+# class InputOptions(PreferencesPlugin):
+    # name = 'Input Options'
+    # icon = I('arrow-down.png')
+    # gui_name = _('Input options')
+    # category = 'Conversion'
+    # gui_category = _('Conversion')
+    # category_order = 2
+    # name_order = 1
+    # config_widget = 'ebook_converter.gui2.preferences.conversion:InputOptions'
+    # description = _('Set conversion options specific to each input format')
 
-    def create_widget(self, *args, **kwargs):
-        # The DOC Input plugin tries to override this
-        self.config_widget = 'ebook_converter.gui2.preferences.conversion:InputOptions'
-        return PreferencesPlugin.create_widget(self, *args, **kwargs)
+    # def create_widget(self, *args, **kwargs):
+        # # The DOC Input plugin tries to override this
+        # self.config_widget = 'ebook_converter.gui2.preferences.conversion:InputOptions'
+        # return PreferencesPlugin.create_widget(self, *args, **kwargs)
 
 
-class CommonOptions(PreferencesPlugin):
-    name = 'Common Options'
-    icon = I('convert.png')
-    gui_name = _('Common options')
-    category = 'Conversion'
-    gui_category = _('Conversion')
-    category_order = 2
-    name_order = 2
-    config_widget = 'ebook_converter.gui2.preferences.conversion:CommonOptions'
-    description = _('Set conversion options common to all formats')
+# class CommonOptions(PreferencesPlugin):
+    # name = 'Common Options'
+    # icon = I('convert.png')
+    # gui_name = _('Common options')
+    # category = 'Conversion'
+    # gui_category = _('Conversion')
+    # category_order = 2
+    # name_order = 2
+    # config_widget = 'ebook_converter.gui2.preferences.conversion:CommonOptions'
+    # description = _('Set conversion options common to all formats')
 
 
-class OutputOptions(PreferencesPlugin):
-    name = 'Output Options'
-    icon = I('arrow-up.png')
-    gui_name = _('Output options')
-    category = 'Conversion'
-    gui_category = _('Conversion')
-    category_order = 2
-    name_order = 3
-    config_widget = 'ebook_converter.gui2.preferences.conversion:OutputOptions'
-    description = _('Set conversion options specific to each output format')
+# class OutputOptions(PreferencesPlugin):
+    # name = 'Output Options'
+    # icon = I('arrow-up.png')
+    # gui_name = _('Output options')
+    # category = 'Conversion'
+    # gui_category = _('Conversion')
+    # category_order = 2
+    # name_order = 3
+    # config_widget = 'ebook_converter.gui2.preferences.conversion:OutputOptions'
+    # description = _('Set conversion options specific to each output format')
 
 
-class Adding(PreferencesPlugin):
-    name = 'Adding'
-    icon = I('add_book.png')
-    gui_name = _('Adding books')
-    category = 'Import/Export'
-    gui_category = _('Import/export')
-    category_order = 3
-    name_order = 1
-    config_widget = 'ebook_converter.gui2.preferences.adding'
-    description = _('Control how calibre reads metadata from files when '
-            'adding books')
+# class Adding(PreferencesPlugin):
+    # name = 'Adding'
+    # icon = I('add_book.png')
+    # gui_name = _('Adding books')
+    # category = 'Import/Export'
+    # gui_category = _('Import/export')
+    # category_order = 3
+    # name_order = 1
+    # config_widget = 'ebook_converter.gui2.preferences.adding'
+    # description = _('Control how calibre reads metadata from files when '
+            # 'adding books')
 
 
-class Saving(PreferencesPlugin):
-    name = 'Saving'
-    icon = I('save.png')
-    gui_name = _('Saving books to disk')
-    category = 'Import/Export'
-    gui_category = _('Import/export')
-    category_order = 3
-    name_order = 2
-    config_widget = 'ebook_converter.gui2.preferences.saving'
-    description = _('Control how calibre exports files from its database '
-            'to disk when using Save to disk')
+# class Saving(PreferencesPlugin):
+    # name = 'Saving'
+    # icon = I('save.png')
+    # gui_name = _('Saving books to disk')
+    # category = 'Import/Export'
+    # gui_category = _('Import/export')
+    # category_order = 3
+    # name_order = 2
+    # config_widget = 'ebook_converter.gui2.preferences.saving'
+    # description = _('Control how calibre exports files from its database '
+            # 'to disk when using Save to disk')
 
 
-class Sending(PreferencesPlugin):
-    name = 'Sending'
-    icon = I('sync.png')
-    gui_name = _('Sending books to devices')
-    category = 'Import/Export'
-    gui_category = _('Import/export')
-    category_order = 3
-    name_order = 3
-    config_widget = 'ebook_converter.gui2.preferences.sending'
-    description = _('Control how calibre transfers files to your '
-            'e-book reader')
+# class Sending(PreferencesPlugin):
+    # name = 'Sending'
+    # icon = I('sync.png')
+    # gui_name = _('Sending books to devices')
+    # category = 'Import/Export'
+    # gui_category = _('Import/export')
+    # category_order = 3
+    # name_order = 3
+    # config_widget = 'ebook_converter.gui2.preferences.sending'
+    # description = _('Control how calibre transfers files to your '
+            # 'e-book reader')
 
 
-class Plugboard(PreferencesPlugin):
-    name = 'Plugboard'
-    icon = I('plugboard.png')
-    gui_name = _('Metadata plugboards')
-    category = 'Import/Export'
-    gui_category = _('Import/export')
-    category_order = 3
-    name_order = 4
-    config_widget = 'ebook_converter.gui2.preferences.plugboard'
-    description = _('Change metadata fields before saving/sending')
+# class Plugboard(PreferencesPlugin):
+    # name = 'Plugboard'
+    # icon = I('plugboard.png')
+    # gui_name = _('Metadata plugboards')
+    # category = 'Import/Export'
+    # gui_category = _('Import/export')
+    # category_order = 3
+    # name_order = 4
+    # config_widget = 'ebook_converter.gui2.preferences.plugboard'
+    # description = _('Change metadata fields before saving/sending')
 
 
-class TemplateFunctions(PreferencesPlugin):
-    name = 'TemplateFunctions'
-    icon = I('template_funcs.png')
-    gui_name = _('Template functions')
-    category = 'Advanced'
-    gui_category = _('Advanced')
-    category_order = 5
-    name_order = 5
-    config_widget = 'ebook_converter.gui2.preferences.template_functions'
-    description = _('Create your own template functions')
+# class TemplateFunctions(PreferencesPlugin):
+    # name = 'TemplateFunctions'
+    # icon = I('template_funcs.png')
+    # gui_name = _('Template functions')
+    # category = 'Advanced'
+    # gui_category = _('Advanced')
+    # category_order = 5
+    # name_order = 5
+    # config_widget = 'ebook_converter.gui2.preferences.template_functions'
+    # description = _('Create your own template functions')
 
 
-class Email(PreferencesPlugin):
-    name = 'Email'
-    icon = I('mail.png')
-    gui_name = _('Sharing books by email')
-    category = 'Sharing'
-    gui_category = _('Sharing')
-    category_order = 4
-    name_order = 1
-    config_widget = 'ebook_converter.gui2.preferences.emailp'
-    description = _('Setup sharing of books via email. Can be used '
-            'for automatic sending of downloaded news to your devices')
+# class Email(PreferencesPlugin):
+    # name = 'Email'
+    # icon = I('mail.png')
+    # gui_name = _('Sharing books by email')
+    # category = 'Sharing'
+    # gui_category = _('Sharing')
+    # category_order = 4
+    # name_order = 1
+    # config_widget = 'ebook_converter.gui2.preferences.emailp'
+    # description = _('Setup sharing of books via email. Can be used '
+            # 'for automatic sending of downloaded news to your devices')
 
 
-class Server(PreferencesPlugin):
-    name = 'Server'
-    icon = I('network-server.png')
-    gui_name = _('Sharing over the net')
-    category = 'Sharing'
-    gui_category = _('Sharing')
-    category_order = 4
-    name_order = 2
-    config_widget = 'ebook_converter.gui2.preferences.server'
-    description = _('Setup the calibre Content server which will '
-            'give you access to your calibre library from anywhere, '
-            'on any device, over the internet')
+# class Server(PreferencesPlugin):
+    # name = 'Server'
+    # icon = I('network-server.png')
+    # gui_name = _('Sharing over the net')
+    # category = 'Sharing'
+    # gui_category = _('Sharing')
+    # category_order = 4
+    # name_order = 2
+    # config_widget = 'ebook_converter.gui2.preferences.server'
+    # description = _('Setup the calibre Content server which will '
+            # 'give you access to your calibre library from anywhere, '
+            # 'on any device, over the internet')
 
 
-class MetadataSources(PreferencesPlugin):
-    name = 'Metadata download'
-    icon = I('download-metadata.png')
-    gui_name = _('Metadata download')
-    category = 'Sharing'
-    gui_category = _('Sharing')
-    category_order = 4
-    name_order = 3
-    config_widget = 'ebook_converter.gui2.preferences.metadata_sources'
-    description = _('Control how calibre downloads e-book metadata from the net')
+# class MetadataSources(PreferencesPlugin):
+    # name = 'Metadata download'
+    # icon = I('download-metadata.png')
+    # gui_name = _('Metadata download')
+    # category = 'Sharing'
+    # gui_category = _('Sharing')
+    # category_order = 4
+    # name_order = 3
+    # config_widget = 'ebook_converter.gui2.preferences.metadata_sources'
+    # description = _('Control how calibre downloads e-book metadata from the net')
 
 
-class IgnoredDevices(PreferencesPlugin):
-    name = 'Ignored Devices'
-    icon = I('reader.png')
-    gui_name = _('Ignored devices')
-    category = 'Sharing'
-    gui_category = _('Sharing')
-    category_order = 4
-    name_order = 4
-    config_widget = 'ebook_converter.gui2.preferences.ignored_devices'
-    description = _('Control which devices calibre will ignore when they are connected '
-            'to the computer.')
+# class IgnoredDevices(PreferencesPlugin):
+    # name = 'Ignored Devices'
+    # icon = I('reader.png')
+    # gui_name = _('Ignored devices')
+    # category = 'Sharing'
+    # gui_category = _('Sharing')
+    # category_order = 4
+    # name_order = 4
+    # config_widget = 'ebook_converter.gui2.preferences.ignored_devices'
+    # description = _('Control which devices calibre will ignore when they are connected '
+            # 'to the computer.')
 
 
-class Plugins(PreferencesPlugin):
-    name = 'Plugins'
-    icon = I('plugins.png')
-    gui_name = _('Plugins')
-    category = 'Advanced'
-    gui_category = _('Advanced')
-    category_order = 5
-    name_order = 1
-    config_widget = 'ebook_converter.gui2.preferences.plugins'
-    description = _('Add/remove/customize various bits of calibre '
-            'functionality')
+# class Plugins(PreferencesPlugin):
+    # name = 'Plugins'
+    # icon = I('plugins.png')
+    # gui_name = _('Plugins')
+    # category = 'Advanced'
+    # gui_category = _('Advanced')
+    # category_order = 5
+    # name_order = 1
+    # config_widget = 'ebook_converter.gui2.preferences.plugins'
+    # description = _('Add/remove/customize various bits of calibre '
+            # 'functionality')
 
 
-class Tweaks(PreferencesPlugin):
-    name = 'Tweaks'
-    icon = I('tweaks.png')
-    gui_name = _('Tweaks')
-    category = 'Advanced'
-    gui_category = _('Advanced')
-    category_order = 5
-    name_order = 2
-    config_widget = 'ebook_converter.gui2.preferences.tweaks'
-    description = _('Fine tune how calibre behaves in various contexts')
+# class Tweaks(PreferencesPlugin):
+    # name = 'Tweaks'
+    # icon = I('tweaks.png')
+    # gui_name = _('Tweaks')
+    # category = 'Advanced'
+    # gui_category = _('Advanced')
+    # category_order = 5
+    # name_order = 2
+    # config_widget = 'ebook_converter.gui2.preferences.tweaks'
+    # description = _('Fine tune how calibre behaves in various contexts')
 
 
-class Keyboard(PreferencesPlugin):
-    name = 'Keyboard'
-    icon = I('keyboard-prefs.png')
-    gui_name = _('Shortcuts')
-    category = 'Advanced'
-    gui_category = _('Advanced')
-    category_order = 5
-    name_order = 4
-    config_widget = 'ebook_converter.gui2.preferences.keyboard'
-    description = _('Customize the keyboard shortcuts used by calibre')
+# class Keyboard(PreferencesPlugin):
+    # name = 'Keyboard'
+    # icon = I('keyboard-prefs.png')
+    # gui_name = _('Shortcuts')
+    # category = 'Advanced'
+    # gui_category = _('Advanced')
+    # category_order = 5
+    # name_order = 4
+    # config_widget = 'ebook_converter.gui2.preferences.keyboard'
+    # description = _('Customize the keyboard shortcuts used by calibre')
 
 
-class Misc(PreferencesPlugin):
-    name = 'Misc'
-    icon = I('exec.png')
-    gui_name = _('Miscellaneous')
-    category = 'Advanced'
-    gui_category = _('Advanced')
-    category_order = 5
-    name_order = 3
-    config_widget = 'ebook_converter.gui2.preferences.misc'
-    description = _('Miscellaneous advanced configuration')
+# class Misc(PreferencesPlugin):
+    # name = 'Misc'
+    # icon = I('exec.png')
+    # gui_name = _('Miscellaneous')
+    # category = 'Advanced'
+    # gui_category = _('Advanced')
+    # category_order = 5
+    # name_order = 3
+    # config_widget = 'ebook_converter.gui2.preferences.misc'
+    # description = _('Miscellaneous advanced configuration')
 
 
-plugins += [LookAndFeel, Behavior, Columns, Toolbar, Search, InputOptions,
-        CommonOptions, OutputOptions, Adding, Saving, Sending, Plugboard,
-        Email, Server, Plugins, Tweaks, Misc, TemplateFunctions,
-        MetadataSources, Keyboard, IgnoredDevices]
+# plugins += [LookAndFeel, Behavior, Columns, Toolbar, Search, InputOptions,
+        # CommonOptions, OutputOptions, Adding, Saving, Sending, Plugboard,
+        # Email, Server, Plugins, Tweaks, Misc, TemplateFunctions,
+        # MetadataSources, Keyboard, IgnoredDevices]
 
 # }}}
 
diff --git a/ebook_converter/customize/conversion.py b/ebook_converter/customize/conversion.py
index 2e5d96d..8a3a718 100644
--- a/ebook_converter/customize/conversion.py
+++ b/ebook_converter/customize/conversion.py
@@ -95,37 +95,6 @@ class DummyReporter(object):
         pass
 
 
-def gui_configuration_widget(name, parent, get_option_by_name,
-        get_option_help, db, book_id, for_output=True):
-    import importlib
-
-    def widget_factory(cls):
-        return cls(parent, get_option_by_name,
-            get_option_help, db, book_id)
-
-    if for_output:
-        try:
-            output_widget = importlib.import_module(
-                    'ebook_converter.gui2.convert.'+name)
-            pw = output_widget.PluginWidget
-            pw.ICON = I('back.png')
-            pw.HELP = _('Options specific to the output format.')
-            return widget_factory(pw)
-        except ImportError:
-            pass
-    else:
-        try:
-            input_widget = importlib.import_module(
-                    'ebook_converter.gui2.convert.'+name)
-            pw = input_widget.PluginWidget
-            pw.ICON = I('forward.png')
-            pw.HELP = _('Options specific to the input format.')
-            return widget_factory(pw)
-        except ImportError:
-            pass
-    return None
-
-
 class InputFormatPlugin(Plugin):
 
     '''
@@ -262,17 +231,6 @@ class InputFormatPlugin(Plugin):
         '''
         pass
 
-    def gui_configuration_widget(self, parent, get_option_by_name,
-            get_option_help, db, book_id=None):
-        '''
-        Called to create the widget used for configuring this plugin in the
-        calibre GUI. The widget must be an instance of the PluginWidget class.
-        See the builtin input plugins for examples.
-        '''
-        name = self.name.lower().replace(' ', '_')
-        return gui_configuration_widget(name, parent, get_option_by_name,
-                get_option_help, db, book_id, for_output=False)
-
 
 class OutputFormatPlugin(Plugin):
 
@@ -363,14 +321,3 @@ class OutputFormatPlugin(Plugin):
 
         '''
         pass
-
-    def gui_configuration_widget(self, parent, get_option_by_name,
-            get_option_help, db, book_id=None):
-        '''
-        Called to create the widget used for configuring this plugin in the
-        calibre GUI. The widget must be an instance of the PluginWidget class.
-        See the builtin output plugins for examples.
-        '''
-        name = self.name.lower().replace(' ', '_')
-        return gui_configuration_widget(name, parent, get_option_by_name,
-                get_option_help, db, book_id, for_output=True)
diff --git a/ebook_converter/devices/interface.py b/ebook_converter/devices/interface.py
index 312249b..7bcc18c 100644
--- a/ebook_converter/devices/interface.py
+++ b/ebook_converter/devices/interface.py
@@ -66,7 +66,7 @@ class DevicePlugin(Plugin):
     path_sep = os.sep
 
     #: Icon for this device
-    icon = I('reader.png')
+    icon = None
 
     # Encapsulates an annotation fetched from the device
     UserAnnotation = namedtuple('Annotation','type, value')
diff --git a/ebook_converter/utils/config_base.py b/ebook_converter/utils/config_base.py
index 76b84f3..0352435 100644
--- a/ebook_converter/utils/config_base.py
+++ b/ebook_converter/utils/config_base.py
@@ -635,9 +635,8 @@ def read_custom_tweaks():
 
 
 def default_tweaks_raw():
-    with open(pkg_resources.resource_filename('ebook_converter',
-                                              'data/default_tweaks.py')) as f:
-        return f.read().encode()
+    return pkg_resources.resource_filename('ebook_converter',
+                                           'data/default_tweaks.py')
 
 
 def read_tweaks():
diff --git a/ebook_converter/utils/img.py b/ebook_converter/utils/img.py
index 28a7646..69e4e0d 100644
--- a/ebook_converter/utils/img.py
+++ b/ebook_converter/utils/img.py
@@ -626,10 +626,12 @@ def encode_jpeg(file_path, quality=80):
 
 
 def test():  # {{{
+    # TODO(gryf): move this test to separate file.
     from ebook_converter.ptempfile import TemporaryDirectory
     from ebook_converter import CurrentDir
     from glob import glob
-    img = image_from_data(I('lt.png', data=True, allow_user_override=False))
+    # TODO(gryf): make the sample image out of pillow or smth
+    # img = image_from_data(I('lt.png', data=True, allow_user_override=False))
     with TemporaryDirectory() as tdir, CurrentDir(tdir):
         save_image(img, 'test.jpg')
         ret = optimize_jpeg('test.jpg')
@@ -638,7 +640,9 @@ def test():  # {{{
         ret = encode_jpeg('test.jpg')
         if ret is not None:
             raise SystemExit('encode_jpeg failed: %s' % ret)
-        shutil.copyfile(I('lt.png'), 'test.png')
+        # TODO(gryf): make the sample image out of pillow or smth. for sure
+        # tempfile would be better idea.
+        #shutil.copyfile(I('lt.png'), 'test.png')
         ret = optimize_png('test.png')
         if ret is not None:
             raise SystemExit('optimize_png failed: %s' % ret)
diff --git a/ebook_converter/utils/resources.py b/ebook_converter/utils/resources.py
index 797d55d..4ea8b03 100644
--- a/ebook_converter/utils/resources.py
+++ b/ebook_converter/utils/resources.py
@@ -98,7 +98,3 @@ def get_image_path(path, data=False, allow_user_override=True):
 
 def set_data(path, data=None):
     return _resolver.set_data(path, data)
-
-
-builtins.__dict__['P'] = get_path
-builtins.__dict__['I'] = get_image_path