I see tauren decoratively paint their horns. But what if, MORE?
And think about it, the customizations are near limitless! What would a shaman’s paints look in comparison to a Sunwalker? Or a druid’s? It’s not just shape and colors, but there could be animals and portraits too! Would tribes paint their horns similarly so as to tell each other apart when several tribes gather? What about during a funeral rite?

