A few years back, there was a fad of "Photomosaic" posters. For example, you could buy a poster which looked like Yoda from a distance, but if you looked at it up close, it was made up of thousands of tiny pictures taken from the various Star Wars movies.
I found an open-source implementation of a Photo Mosaic algorithm, made a couple of small changes, and used it to generate photo mosaics of Eva.
