Here is yet another very interesting Arduino project. I Am Jen over at instructables has created a pair of light up sneakers that have illumination patterns that can be changed by tapping your feet together. This is a really interesting application of a magnet and reed switch. Arduino code is included and all the steps look well photographed. This project uses a RBBB Arduino, but I would think that just about any board will work.
Check out the video!
This would go great with some deadmau5 or Daft Punk!