Here is a small demo I with my project mate did. It is a color tracking-based traditional snake game. The head of the snake is controlled by the movement of the chosen color. We used a red marker cap for it. The implementation is on Beagleboard-xM which runs Angstrom OS. Frames are captured by a reasonably good Logitech USB Camera. The display is by HDMI cable from board to monitor. [The famous Sixth sense by Pranav Mistry would be extension of this simple task. As Beagleboard can be run on 5V battery which makes the device mobile] . The algorithm used is a modified CAMShift, tailored by us to optimally run on Embedded devices.
Video of the same is available below