Vaaish, wouldn't it work even better if the alien-in-the-middle were animations? Not too much movement, just as you say, to set the mood. I remember watching Aliens when I was 11. One of the best things with that movie was in the original version they never showed the aliens on-screen until the reactor scene. It was obvious that there were aliens on the planet, but it set the mood. So, moody and dark animations are my suggestion. Keep the rings around the middle area, move the menu more to the center (in fact, just move it right until it's dead center) but not so it's interfearing with the animation.