I've been working on a little snake game for Maker Faire. It's made in Processing using MSAFluid, Minim, OpenGL and is controllable via a Simon board or WiiMote.

Here is the source code for anyone who wants to check it out.

Connect an FTDI to the Simon board, reprogram it to send serial "1-4" for each of the buttons and use as a controller for Snake.

UPDATE:
Work a bit more on this today, made it a bit more 3d looking.

The serial side of things is commented out in this version. but you can use wasd and ijkl to control the players with your keyboard.