ScrumbleShip is the most accurate space combat simulation devised to date. Gather resources, construct a capital ship out of individual blocks, then pilot it with AI or human help against other players.
This image is released on a CC-BY-ND 3.0 license.
I placed a few lights on the asteroid, to make it more visible. You can see sort of a lumpy potato shape in this asteroid, and speckles of various materials.
Cheers!