I spent a good chunk of Sunday morning at World Maker Faire chatting with Cerebus333 and promised him I'd remix his Rock Frog when I returned to Zheng Labs. Cerebus even gave me a signed original: http://www.thingiverse.com/make:48828
to take home.
This remixed Rock Frog would make a fine earth golem or elemental for your RPG of choice.
You can read extensive documentation of the remixing process in my Anatomy of a Remix blog post http://zheng3.com/2013/09/30/anatomy-of-a-remix/
including modeling tips and a downloadable model in t-pose in case you'd like to rig the character yourself.