A Well Lit Room.

Occasionally, we find ourselves with little to work with.  For some, that may be money or just dinner ingredients.  As a strobist (a photographer that use artificial light), I often have complete control over the outcome of my work.  I'm huge on having the perfect rim light, keyed with a gentle Butterfly or Rembrandt style setup.  Sometimes very little is just right.  
I'll take window light any day.