Arduino Joystick control of colorful Graphics on PC / MAC

After quite a bit of digging, I got a nice example of Arduino controlling some Graphics on the PC using Processing.

A regular Joystick on Arduino sends serial data to Processing on the PC or MAC. This example creates a window with a colored ellipse whose X and Y size is controlled by the Joystick and whose push-down switch cycles through some colors.

Arduino and Processing sketches are on the ArduinoInfo.Info WIKI HERE: Looks like this but bigger:

Comments or suggestions welcome.

Any pointers to a good working video game that the Arduino joystick controls would be appreciated. I'm trying to get more interesting examples for middle/high school kids.