We had an assignment to make a movie, lasting one hour, in some random way.
I used a Wii controller (Wiimote) to generate a black and white drawing. The wiimote has an infrared-reveiver which can track IR-light and can be used to control your cursor. Since candles send out infrared light, which changes when the flame moves, you can use it to move your mouse in a random way, just by opening a window to let some wind in.

Made using Darwiin Remote to receive the wiimote data, and Processing to make the drawing.