well, I would say don't change anything :S it's a golem, golems don't have any particular shape.
also to make rocks, I can't really explain it, LOL I just draw them as I think of them :S
try to make them "Triangle shape" with a pointy edge pointing at you, then have 3 different values (one on each side) and ta da, a rock has been born xD
I can paint one or two on it so you can see, but I can't really explain it with words, i'm sorry :/