Build a Marble Run with Craft Sticks - Frugal Fun For Boys. This site has tons of other great ideas for boys too!
Torch Made From Coke Can and Cereal Box.
How to make a homemade flashlight . 1 flashlight bulb (Standard – NOT threaded) 2 AA Batteries 1 Large cereal box to make the main body parts or long) 1 soda can for making the bulb holder and switch mechanism ----