I'd give Rhino a go, once you get the idea of nurbs, it's got many tools for both worlds. Organics or Mechcanicals. Here's a greyhound that I've been working on.

I must not fear.
Fear is the mind killer.
Fear is the little death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past, I will turn the inner eye to see its path.
When the fear has gone there will be nothing.
Only I will remain. 

 Frank Herbert, author of Dune