This is something I didn't plan at all. I was doodling and experimenting with Photoshop and.... this is what it came out! I tried to balance cool and warm colours on their respective side, and introduced another colour in the middle (air shuttle).
Anyways... as you may presume that "rock" is a head of an angry wolf (or something like that!). I used no reference for this one - as I said it was totally unplanned!