OK, this is one of the coolest things I’ve seen in quite some time. The Rasterbator (great name for the service too…) will take your photo and blow it up into a giant PDF of dots that you can print out on multiple pages that you can then re-assemble into a giant version of your original. Suitable for walls… etc. VERY cool!! There’s a gallery of rasterbated images up on their site too…

Rasterbation example