J.G.
I don't get it. Tell us more. You have to use cardboard and old cans to make something useful? Like a birdfeeder?
If that's kinda what you're looking for, I say make a bird feeder out of old bean cans glued together for walls, scraps of wood for the platform perhaps?
Or make a nice little jewelry holder out of an old egg crate.
(if you use old cans, buy the can opener that they sell at the grocery store that has a smooth cut on it. It took some getting used to (it is harder to use) but when you open a can, the lid is smooth and the can edge is smooth.)