- Ambient Mood Cube - Install an ultrasonic motion detector and have the cube change its color due to your personal proximity. Kinda like a colorful greeting for a close encounter.
- Interactive Ambient Art Cube - Add an accelerometer and create a cube that changes its color based on X-Y-Z orientation. Play with it, toss it around; the color changes due to your movements.
- Weather Cube - Connect a barometric pressure sensor to the Arduino and program specific color changes for different barometric pressure readings. For example, make high pressure green, low pressure red, rising pressure, blue, and falling pressure yellow.