Its been brought up before, but given the kinds of customization allied races are getting, it seems like a time to ask about this.
Saw this awesome Zanadarli piece the other day.
pretty distinctive, personally I'd love the option for some races to have it, especially horde races, since it adds that extra kind of tribal aesthetic.
Obviously this would be exclusive to males because blizzard wouldn't be able to justify females having theres on display, despite in the real world you'd probably see tribal women sporting them as much as men. But obviously limitations are obvious.
And before anyone says 'but we won't see them', that same thing was said in argument against tattoos years ago, and we now have transmoggable armor to show them off.
I actually think there should have been more options for piercings in general, nose, lip, eyebrow, given some of the weird ear clips elves have now, it only seems fair.
Edit: Races I imagine having them, Zandalari trolls, Darkspear Trolls, Tauren, Orcs, Dwarves, Dark Iron Dwarves, maybe humans and night elves.