DS Daily: The NES can do anything

Is there anything the NES and its controllers can't do? After seeing the evidence, we're guessing no. The latest? Some intrepid fan turned an old NES controller into a mouse, and now we want one. It's either that, or we want to do something cool of our own ... but the problem is, we're stumped. In these situations, we turn to you. If you had the means and the know-how to make something from an old NES or controller, what would you do? One of these examples, or something totally different?