Как я могу создать тему GTK из списка параметров?

Найдите правильные строки в файле gtkrc, такие как bg_color и т. Д.

Затем просто измените шестнадцатеричные значения (воспользуйтесь поиском gedit, чтобы найти его) на те, которые вы использовали, сохраните и перезагрузите тему.

То же самое касается GTK 3, отредактируйте шестнадцатеричные значения в файле gtk.css

Where to get GTK themes
You can get GTK themes from, for example, xfce-look.org gnome-look.org deviantart.com
How do I install these themes?
You only need to untar those themes under ~/.themes, so first:
mkdir ~/.themes
and then:
cd ~/.themes
tar -zxvf theme-name-here.tar.gz      or
tar -jxvf theme-name-here.tar.bz2
Make sure you check the readme for what engines the theme needs. You can most likely install them through your package manager, like:
apt-get install gtk2-engines-pixbuf    or
apt-get install gtk2-engines-*         or
emerge gtk2-engines-pixbuf
You should get the idea.
And to use them?
GTK2

Get gtk-theme-switch (note that there is also a version for GTK2) or gtk-chtheme. Then just fire 'em up and you should see a nice list of all styles. Just select the one you want to use and click Apply. You can also use LXAppearance to change the gtk-themes.

This shows you how to edit GTK settings without any extra application installed.
Install the GTK theme as shown above (extract theme to ~/.themes and icon set to ~/.icons). 
Create or edit the ~/.gtkrc-2.0 file. In that file input parameters such as the following:
#sets the font
 gtk-font-name = "sans 8" 

#sets the theme
 gtk-theme-name = "Clearlooks Crystal 1.1" 

#sets the icon theme
 gtk-icon-theme-name = "CrystalClear-GNOME-1.0.0" 

#shows only icons in the toolbar
 gtk-toolbar-style = GTK_TOOLBAR_ICONS 

#shows small icons in the toolbar
 gtk-toolbar-icon-size = GTK_ICON_SIZE_SMALL_TOOLBAR    

#sets the background color in Rox back to white because some GTK themes set it to light gray
 style "rox" = "default"
 {
   bg[NORMAL] = "#ffffff"
   bg[ACTIVE] = "#ffffff"
 }
 widget_class "*Collection*" style "rox"
Resources: http://www.gtk.org/api/2.6/gtk/GtkSettings.html

You can also use a different GTK theme, icon theme and fonts for specific GTK applications. If you just want to change the GTK theme, run your application with the following command:
GTK2_RC_FILES=/path/to/your/theme/gtkrc your_application
If you like to set a custom icon theme and font, create an empty file wherever you find convenient and call it whatever you want (for example, ~/.themes/custom.gtkrc). Then fill it with your different settings:
gtk-font-name = "sans 7" 

gtk-theme-name = "niroki" 

gtk-icon-theme-name = "SimplyGrey"
Now run the application with the following command:
GTK2_RC_FILES=/path/to/your/custom.gtkrc your_application
Add the command in your menu or launcher and enjoy.
GTK3

To use GTK3 themes, edit (or create) the ~/.config/gtk-3.0/settings.ini file. Specify the theme you want with the gtk-theme-name parameter. For example, if you want to use the Adwaita theme, your settings.ini file should looks like :
[settings]
gtk-theme-name = mindaryan
That's it.

Я надеюсь, что это может помочь тебе, извини, мой друг, я пытаюсь помочь ........