Make PPE milk bottles into good looking LED lights, and use an Arduino to control them. This recycles a number of things, mainly the milk bottles, and uses a very low amount of power: the LEDs apparently dissipate less than 3 watts but are bright enough to see by.
Among other things, I wanted to see if I could make an electronic light feel more human friendly than most, and found rotary controllers are a good way of doing this.
PPE milk bottles make for a cheap yet aesthetically pleasing way to diffuse LED lighting. Especially if you can find nice round ones :)
Modding an object with LED lighting is not only environmentally friendly, but also much more straightforward than building a housing from scratch. Because LEDs are tiny, you can put them almost anywhere, and they don't produce much heat as long as they're spread out and running at the correct voltage.
This instructable will deal mainly with physical design and production, and I'm going to assume you have a basic knowledge of creating electronic circuits and LED lighting. Since the exact LEDs and power supply you use will probably vary, I'll only go into the basics of my circuit in terms of specs. I'll also try to point you to useful resources, and explain more about the Arduino microcontroller and code that tells them to work in sequence.
The electronics of basic LED lighting are really simple, similar to elementary school electronics, so probably won't take long for you to pick up at all.