The Makey Makey controller is a lot of fun to use, since it allows you to create your own computer input devices out of the things you have available nearby. You plug the Makey Makey into the USB port on your computer, which sees it as a keyboard and a mouse. There are many things that you can create with this amazing tool. When I was showing it to a friend recently, I set it up so that when he took a drink from his cup, the computer would think that he clicked the mouse button, which sent a tweet. You can do a lot with the Makey Makey.
In this project, I made a few arrow controllers out of a file folder, some 3″x5″ cards, craft sticks and aluminum tape. The first idea I had turned out not to work as good as I originally thought it would, so I tried it again (a couple of times). It would be fun to create a game controller that is themed on the games a player might enjoy, or to make one that uses all of the controls built into the Makey Makey.
Working with this controller in combination with writing computer programs would also open up a lot of really amazing options.
There are photos of this project.