First off, once again, here's a the best gallery I could find of high-res versions of the Windows 7 desktop backgrounds. Second, thanks to a commenter, here's a website showing all of the Windows 7 desktop backgrounds, along with links to the artists' sites. My favorite and the one that seems to be used in all the press about Windows 7 is by Nanospore (which has a terribly user unfriendly site).
Finally, here's a robot/spray can (?) toy by Nanospore and Devilrobots
on sale here.
*Previously: Monstrous Spray Can.
*Buy graffiti collections at Amazon.