check out the credits on the bottom of the image - by Derek Brealey, using some of the better 3D Trek models out there. I don't know the guy but, from his collection, it looks like he hangs out at scifi-meshes.
BTW, with an image that crowded on your desktop, I can see why you don't use icons.
the first pic here is my current desktop, my wedding (last November).
the next was my previous desktop, a picture of Titan eclipsing the sun with Enceladus and Saturn's rings in the foreground.
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