This isn’t exactly a resource, but I think it is important to keep your work environment inspiring. Smashing Magazine has a great collection of inspiring desktop backgrounds for your mac (or pc, if you haven’t seen the light yet.) Hopefully you’ll find one you like, or get inspiration to create a new one yourself.
You can also click http://www.inspiringdesktop.blogspot.com for another Inspirational desktop wallpapers for your computer. These magnificient images complemented with thought provoking inspirational quotes will add a touch of delight on your desktop.