There's some amazing collections of printable 3D models available on Thingverse. For example, what looks like a remodel (or perhaps the original 3d model?) used for an ALIEN film "Space Jockey" statue:
There's a variety of others saved in peoples themed "Collections" - well worth checking out if you want to do a small model-scale print on Shapeways, or a full sized one on a home 3D printer. The artist for this statue in particular, Geoffro has some amazing files available from a variety of SF genres.