Figments of Splendour can be used to acquire cosmetics.

Embers or Motes of Enchantment can be converted at the vendor to Figments of Splendor.

Availability 

Figments of Splendour Barterers are not always available in-game.

Currently available:
– Keeper of Mysteries
– Rowan Raspberry

Currently unavailable:
– Filbert Fig
– Curator