Retrievr is an experimental service which lets you search and explore in a selection of Flickr images by drawing a rough sketch. Currently the index contains many of Flickr’s most interesting images. If you’d like to have your images (or the images for a specific tag) added, please let me know. A submission interface is planned!
It really does work surprisingly well. Try it, and waste countless time like I have. 
Wandering the Interwebs 