Someone modified a creeper statue we had on our server depicting a sword going through a creeper to mean "No griefing". It was copied and modified with a pickaxe to be used on a secondary map which was a survival type.
Thanks, now I cannot get that one part out of my head.
"'Cause baby tonight, the creeper's trying to steal all our stuff again
So baby tonight, grab your pick, shovel, and bolt again."