" This clever project uses CD jewel cases to make rearrangeable, refillable photo frames for those empty walls of yours. Hang them individually, or tile them together to make a photo mural, shown below. "... excerpt from Photojojo! I looovvvee this! This project is all about - recycling and cheap.
Such a great idea for a kids room, playroom, etc. Complete instructions to make this mural using CD jewel box cases from here. Images from here.