Did you ever think of making towers out of cans? A competition called Canstruction lets one to participate and show ones talent at creating towers and models out of cans of food.
Once the competition is over, these food cans are then given to food banks, and so on to feed the needy people.
The participants are allowed to use only ¼ inch thick flat material for leveling the structure, tape, cardboard, wire and rubber bands and the cans of food of course.
These constructions just show the sheer talent of the participants.