Ladyhuffybottom (http://ladyhuffybottom.tumblr.com/) made a comment that she wondered if the others would be growing the horns/ antlers that King Balor had. According to my head canon, the horns were a part of being the seated ruler. Had Nuada or Nuala taken the throne and been acknowledged by the rest of the kingdom as the king or queen, they would have grown the crown of horns. Though they seemed very fond of ornamentation, they didn’t seem to like symbols of authority, unless they were small (like Nuala’s bracelet, which was seen with such reverence and importance). The crown that controlled the Golden Army, of course, was from the goblins — not the elves. The elves were so connected with the natural world that the “Sons of the Earth” literally became earth when they died. It only makes sense to me that they would show their authority over their natural kingdom by growing their crown. It also makes sense, as they would wear it for centuries. Being a ruler would be part of them, literally.