Boar

Credit to viciousdisease for the lovely story!

In the Crystalpine Reaches, strange things tend to happen. Boar was roaming amongst the towering mountainside in his favorite crevices when he found a strange sack laying on the ground. Typically one would not take such a sack, as younger dragons were prone to playing tricks on unsuspecting victims by putting exploding paint contraptions inside. Older dragons could be much more vicious with their pranks, so it was custom to just live those things alone. However, Boar's curiosity got the best of him and he carried the sack off in his mouth. So far, so good, nothing bad had happened.

He slipped quietly past his friends and ducked behind an outcropping that only he knew about, a few yards away from the main area of the lair. Here he would open the bag and have time to hide if anything bad happened..And lots of clear space to toss it if something scary crawled out. He felt around, mushing the contents..It seemed hard, with strange flexible parts. What could that even be?
He opened the sack and it was ... A bag of bones, beads, and feathers. There were large and small skulls as well as fragments of femur and god knows what else. To most dragons, this would be terrifying and perhaps even deadly. However, he wasn't afraid.

He could tell the skulls were of some avian species and it was probably some larger dragons lunch. So, he took them and fashioned the typical birdskull headdress and wingpeace; these would match the blue hues of his body and help him in attracting a mate. There were tiny bells and he attached these as well so that his wings made tinkling faerie-like sounds. He flourished them and pranced proudly back into the lair, showing off his new wardrobe, much to the dismay of several known trickster hatchlings.