Well perhaps this is a bit too early to say this but I think that when the tribal emblems have some sort of showing/use/ armor display, i think it would be good all around to have player made icons.
Have some forum or other way of input on the website so that the artist can choose from among the best looking emblems and input them in-game.
Now obviously without care this could add quite a few gig's of data to the game so maybe have them chosen like once a week or whatever to not go crazy but i think it would add some uniqueness to have bunches of more emblems, currentlly there are too few.