You might have thumbs. But you still got a long way ahead of you!
I saw the E3 prelude for Mass Effect2 and just needed to draw some alien lifeforms. I really dug how well designed everything in that game was, it felt like a living world where aliens has trends and style.
Also I'm playing Dead Space atm. I'm really enjoying it. or it scares the living crap out of me. which is enjoyable. Story is quite cliche and kinda cheesy, but theres just something about long dark tunnels inside a giant space ship filled with flickering lights and monsters.