celos VS Gtk-Theming-Guide

Perhaps somewhere here: https://github.com/TeamCobweb . The best explanation is the celos repository: https://github.com/TeamCobweb/celos . But it should be noted this doesn't contain the code. What it contains is a description of how to recreate a celos distribution.

Here is the link to the latest branch of our repo (Keep in mind, however, that this is currently out of date) Feel free to contribute if you'd like: https://github.com/TeamCobweb/celos/tree/beta7

Look here and here, you should get some ideas.

Here's how to make your own theme or tweak an existing one https://github.com/surajmandalcell/Gtk-Theming-Guide/blob/master/creating_gtk_themes.md

here is a bit of a guide into how to do that. The gtk theme will handle the appearance of all gtk apps. QT themes can also be created separately, but QT has a setting to follow the gtk theme, so gtk is probably the way to go.

Pantheon is build/based on GTK. So, I believe that this will help you. Also, you can always visit gnome-look.org, download a theme and look through its files and see how it is made. You can also build a theme on top of it or use it as a template to get you started, ya know, open source and all those thangs. lol