Looks great for sci-fi, but for more grimdark games I'm thinking more along these lines: <a href="http://www.beastsofwar.com/wp-content/uploads/2011" rel="nofollow">http://www.beastsofwar.com/wp-content/uploads/2011</a>... More industrial, more grates and stains, more cables hanging off the walls, or lights that aren't working. This is purely suggestion of course, I'm just basing it off my memories of playing Space Crusade and trying to suggest tailoring it to that style of game.