Hitachi-powered image search site GazoPa (boy, they’re really out of web names, no?) is a fairly robust engine for finding same or similar images. Its differentiation comes in hunting similar videos, digging through Flickr and letting you draw your search.
Yep, you can use GazoPa’s simple drawing tool to roughly outline the type of image you’re looking for, and GazoPa will use its search prowess to find, well, something akin to what you scribbled. As you can see from the test result below, it knows the basic shapes and colour tones you’re going for, but we don’t have to worry about CyberNet overtaking collective human intelligence just yet.
GazoPa is free to use, no sign-up required.