Wallery is a pack of PHP classes to generate a random map of pictures. You just give a list of picture in entry (with their dimentions) and some extra content if needed for the final rendering. Every page is different, because the positions are choosen randomly. To navigate, just move your mouse to go where you want.
The project is available on GitHub, you can go and judge my bad code.

Try the wallery here

An infinite loop (or not)

Lightbox (Facebox)

"The algorithm is the key."