I for one would love to see the Alien and Predator models, the creatures of nightmares, made.
I know they're not part of the Star Wars universe, but it would be real fun to be able to play as them.
For pictures, there's a lot of referance material at the AvP News site and at the Anchorpoint Essays.
As for sounds, I can provide excellent sounds for both models for every action.

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Archer's Avengers

why dont u do it? i hate all these damn requests

I've tried it before. They end up looking like something that came out of a meat grinder. :/

There's a 99% chance you won't get that model unless someone wants to make it for themselves.