At our circuits camp we worked hard on making light up paper airplanes. This challenged students to think about the direction of an LED, how to wire each leg into a battery and then, of course, how to fold it all up into a plane! It took a bit over an hour to get most of them working which made for some very happy campers.
We spent the rest of the afternoon throwing our airplanes from the observatory roof and the top of a nearby hill.
This is a great activity which only requires copper tape, available at your local hardware store or online, LEDs, and paper!