why change only the color?
check this, my own suggestion for x-mog V.2 for the game:
http://www.mmo-champion.com/threads/...n-transmog-V-2
it basically based upon all the skins and gear model allready exist in the game's databade.
all im suggesting is a dressing room like GUI which lets us design our own x-mog gear by selecting an emty
model at 1st and then selecting its skin texture and after that adding to it a color hue and animation like warlock T6 wings or rouge's
fangs coming out of the shoulders like in T8 i think...
everything is in the database anyways just let us do the match making to design our own x-mog gear.