So cool, It would be escpecaily fun if you were to show it to your friends that dont know about. Also! Like if you agree that we should have a new tool called a chisle that actually changes the texture of a block! I know it seems hard but dinnerbone can almost pull of anything... He did it with stained glass.
It also works if you use an Anvil to rename a Sheep Spawn egg in Creative; every sheep that spawns from that egg will have the attributes of a jeb_ sheep. It works if you put it in a dispenser, hand-spawn it, etc. I'll try spawning a non-jeb_ sheep from a jeb_ sheep next.