This seems like such a great way to teach kids about circuits. I know I loved stickers as a kid (heck, lets be honest: I still love stickers). The kits are a little expensive, but it might be worth buying a couple of the circuit sticker packs and making my own circuit paths.
Simple Electrical Circuits for Kids. (Think of ways to expand this to more complex electrical engineering lessons)
Picture of Constructing an Understanding of Electric Circuits