I tried to get creative with this one, and make it into a night light. The 'rock' hides a wall plug. Wires were soldered to the plug to the hands and eyes, which lit up with 4 LEDs. I think either the wires degraded under the clay, or the voltage was too high (it was stepped down to 3 volts DC), because it stopped working properly a day after it was complete. D'oh!