One of the best parts of swiping the Avatar concepts, is that you can simply make them unarmed fantasy Orientals and no one is the wiser, as they stole their designs from Oriental concepts, so long as nothing matches perfect, you are in the clear.
Works brilliant, I have found a fair few Dungeons and Dragons miniatures that work well repainted. Whirling Steel Monk (lose swords) makes a great Firebender, the Earth Shujenja makes a great Waterbender, I have some others, but can't recall them off the top of my head.Ah well, hopefully someone will get off their tush and make some "Shapers" I think it is a good alternate term.