Look, you didn't know. So, here is the scoop. Copyrighted material on this website is strictly prohibited, and I'm saying this out of experience. BOY did i get in trouble for that, but! i don't want to see a fellow game design enthusiast banned for a simple mistake. Yes, you will need to pull that file down. On this note, here let me give you an idea to check out. Try sculptris, this allows you to create unique entities, and when i say unique i mean unique. Check out sculptris here.
Everything you need to get started is there, though i should warn you. When i mentioned unique, you can actually SCULPT your own entities, then import them in to Wings3D or Milkshape3D. Guys correct me if I'm wrong. But! doing so will allow you to export your entities, as a .x format, mind you. There might be a CRAP TON of polygons in the .x file, just a fair warning.
And I think you should pull those file, and screen shot and title this as something else, before it gets locked and you get in to a world of trouble bud. Just looking out for a fellow game creator, and trying to help you out, in knowing whats ok, and whats a BIG NONO. And this happens to be one of them.
FYI, I'm not a mod. But I've been part of community's that frown on this sort of thing.