From Today and Tomorrow
PhotoSketch (currently offline) is an amazing software developed by five Chinese Computer Science and Technology students. They describe it as an Internet Image Montage program, it composes an image based on a sketch using images found on the internet.
It works like this:
PhotoSketch: Internet Image Montage from Tao Chen on Vimeo.
For more info Clicka Haar. Want to dig deep? Heady .pdf file here.