Hack UR Yard
After working on the Firefly project which has infra red communications and LED lights, why not add the technology to solar lawn lights? I think there is room for exploring both utility and aesthetics.
Conventional solar garden lights can benefit from adding sensors, fully controlled LED lights, communications and a micro-controller. So the lights can communicate to coordinate light effects as well as reflect the environment. Perhaps even interact with your neighbors lights.
Let the hacking begin.