[White_Orpheus]

Admittedly, I'm terrible at lighting, but typically skylighting will do the trick for a simple scene. It's very possible to come up with better looking solutions, but nothing is as easy as the skylight. Just place one of those babies in the scene, and click on "final gather" under indirect illumination in the render panel. The downside is that the render time is pretty long, and you *need* to be using the mental ray renderer.