Chuck Mate got my vote. I love the simplicity of the design and colour. It also feels very alien. The thing reminds me of a critter called the Golden Wheel Spider or some such which cartwheels down sand dunes.
Stephen R - Great creature with loads of character. Good to see something whimsical.
Fozzybar - Sweet render, nice design, lots of character
Jakkas - Great design and render, tons of atmosphere
Romance - Great render. The textures are really strong.