I wanted to create something for my wife as a present and this is what I came up with. This is a dark activated color changing night light. It has a sensor that can tell when the room light is turned off. This then will light a RGB LED and slowly fade through different colors. Its brains is a ATtiny85, but you could also use an Arduino. We have little boys that would appreciate this on at night.
Parts for the Circuit:
Everything can bought at RadioShack but the ATtiny85.
Don't buy the Wall Wort Plug. You or someone you know probably has one they don't use, like the plug to charge a cell phone... When possible, recycle.
Parts for the Light: