I really like this project for converting instamatic cameras into trippy psychedelic photo takers (also to use 35 mm film for easier availability.) I think these sorts of projects are perfect for those of you looking to get kids involved in making. Find a bit of outdated but still highly available (and cheap) technology, and treat that as the raw materials for the project. You get some detritus off the shelf, you teach kids to not be scared of manipulating their tech, and everyone has fun. Mutual benefit for all!