I may have posted this before, but not sure if everyone has seen it.

This thing is called the 'Rasterbator', which takes an image (most formats where the image size is less than 1MB) and spreads the image over multiple pages as large dots. When you put them up on your wall and step back, you have a huge version of the original image.

I'm yet to find a suitable image to rasterbate, but there's some good ones on the gallery!

http://homokaasu.org/rasterbator/