We have found an amazing design over at DesignBoom, a light system called Crystal which is a modular or snap-together LED lamp.
Designed by Taiwan-based company QisDesign, Crystal LED lamp is a standalone icosahedron balls with dim glowing surface. The Crystal has come complete with magnets in its surface which let user to hook up with another Crystal LED lamp where you can form something like the above picture.
No idea how far you can expand the balls, and I wonder if it has an eco-friendly value or not. More detail can be found at Inhabitots.