Get my free environment sphere. Literally thousands of Poser users use it for environmental lighting and to provide something to see in reflections in every direction.

http://sites.google.com/site/bagginsbill/free-stuff/environment-sphere

It's just a sphere that you can load an equirectangular picture onto. You can find such pictures all over the place.  HDRI ones work on it, too.

In render settings, enable IDL (Global Illumination).

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)