I LOVE GRAY.
Way to go, Draeke, maybe try some non-default textures. Default gray textures are nice once in a while, but nonstock gray textures are much, much nicer. (I strongly advise using some of TRaK's texture sets.) You also may want to use the Surface Inspector to rotate and move a lot of those textures, especially around the core (bottom, middle, and top parts). Also, as amz said, you may want to make the lights different colored, white lights on gray is boring. Try light green or blue.