I created my version of a realistic creeper. I think they were a mysterious race of arthropods that were infected and completely taken over by a moss-like parasite. Although they're actually are messed up pigs.
http://www.mediafire.com/download/s7c3ub37m4aktsf/Creeper+Rig.zip
Poor me, never saw it coming.
Note: I was Scaled up even though the rig scales down fine
Here is a clear view.