Aha! This is what we need the Halforum Army of Babies for! We'll wire them up with LEDs and then arrange them to make one giant Halforum smiley. This sounds like a job for Stienman.
You know, that would be an interesting 'global' project. Each person wire their kid/dog/cat up with lights, take a picture, and send it to Stienman (who will have to organize sizes and such) to make the smiley.