These mosaic portraits of geek gods, such as Bill Gates and the creator of Space Invaders Tomohiro Nishikado, are cleverly constructed by Charis Tsevis using thousands of tiny images that directly relate to each subject's claim to fame.
In other words, Nishikado's portrait is made up of little Space Invaders, Gates' portrait is made up of Windows related iconography, and so on. They're really cool looking, and I think they would make awesome desktop backgrounds!
http://www.behance.net/gallery/Gadgets-Games-Robots-and-the-Digital-World/2665299?utm_source=Triggermail&utm_medium=email&utm_campaign=project_cover --via Flavorwire
http://www.digitalartform.com/archives/2004/12/history_of_phot.html