Concept art company Massive Black has done artwork for movies, comics, video games, toys, and more. It's easy to see why from their artwork, which instantly create worlds so vivid, I'm actually angry I can't see more of these places.
Based out of San Francisco and Shanghai, Massive Black has a ton of its concept art up on its website; here are some of the most awesome ones. There are even more at the Massive Black website (including a bunch of illustrations set in the Star Trek universe).
[Massive Black via Concept Ships]