Here are two really fun color search tools for flickr. Be careful - these are addicting. But if you love colors the way I do, these are worth checking out. Behold the fun!
Color Fields Experimental Colr Pickr by Jim Bumgardner
Multicolr Search Lab Flickr Set by Idee Labs
Here's an exercise in black and white. (Speaking of which, don't forget to enter the pcagoe January challenge.)