Tools
Software – Free (as in speech) software for your artwork needs
On Design
Design Guidelines
Pieces – Things to keep in mind when designing windows and widgets
Backgrounds – Guidelines and templates for desktop backgrounds (Wallpapers)
CommunityThemes – Guidelines for creating and packaging themes from within our community
Wiki – What goes where in our wiki
Legal
Licensing – Suitable licenses for your artwork
Technical Documentation
GTK-Themes – Help on GTK-theming
GTK-CSS-Engine – How to build and install it
Plymouth – Resources
GDM
Icon-themes
Packaging