Get Gnome Art at art.gnome.org
An anonymous reader writes "Do you use GNOME? How about GTK+, Sawfish, Metacity, Nautilus, or any other components? Well, then you may want to check out art.gnome.org. A great site, though not fully finished, you can't be anything but woowed by the quality and sexiness of these various pieces of art for your GNOME component. Please no Desktop Wars, just appreciate the work these people put into making GNOME prettier than ever!"
Have you tried Theme Depot?
Here's some places you can go to if you fancy KDE more than Gnome (hey, tastes differ. Get over it already) :
A desktop theme is more than just a background image -- it is also a set of icons, color scheme, fonts, etc. But most relevant to this thread, there is also config information. The format of the config information bundled with the theme is what makes each theme desktop environment specific.
10b||~10b -- aah, what a question!