I have created some pulpy aliens to use with Fantastic Worlds using many bits from GW, mainly skaven bodies and a lot of parts from other boxes...

This is the little leader, with a mask make to inspire fear in his own troops

A sneaky assasin

Some cannon fodder

A radio operator

A hero with big weapon

And a heavy weapons team (inspired in the classic german MG42 teams)

There are many more pictures (with spanish text, sorry, on my blog, here...
Rats in Space