The graphics look great! That's a really nice skin to put out into the community, I'm sure a lot of the sites in that genre would love it.

Probably the only change I would do is to remove the menu options ("Home, Register, FAQ, etc.") off of the navbar and into the cell at the bottom left of banner so that there isn't as much space between the banner and navbar (perhaps using the button images even).
Have you ever considered doing something sci-fi related?