Before I got married I worked for a while at a jr. high with special needs teens. (Most of them just had behavioral problems.) For a science class some of my teens were in they were required to work together as a group to make a Rube Goldberg Machine. The machine is named after an American cartoonist, Reuben Goldberg, who would draw elaborate contraptions for getting mundane, everyday things done, such a teeth brushing.
Here is a link to the official Rube Goldberg site where you can see some of his very clever cartoons.
The guys from my school ended up making a contraption, almost entirely out of books, designed to move my water bottle from one place to another. It was awesome!! This is a very fun type of project you can make big or little, and you can do this with kids of all ages. Even adults.
I got thinking about this because of the following fun music video. (I find the band OK Go fun and uplifting, and very entertaining to watch.)