Magnetic Refrigerator Lights
Here’s a cool instructable on how to turn your fridge into a Lite-Brite. I find the project to be a bit destructive as it involves painting your fridge with conductive paint, but the concept could be taken out of context and you could build it differently. Perhaps as a hangable picture frame. This is something I’ll definitely look into.

by Robert
"The distance is very far. I would have no doubt that you could control it from 100ft -200ft or more. ..."