ReadWriteWeb

Flickr, a popular photo-sharing site owned by Yahoo!, has a ton images available for browsing through. You can search for photos in a multitude of ways including by user, tags, title keywords, and a few more. However, it's a lot tougher to search for images by colors and not many services get it right the first time around. The Multicolr Search Lab is a fantastic tool that does an excellent job of finding great images based on the colors you select.