This happens to be one of my favorite themed events in Rift. By going to your PRI representative in either Sanctum or Meridian you can start the questline to earn "sparkle essencess" that can be used to purchase your very own Opal Unicorn. Complete the "Hooves and Horns" zone event in Moonshade Highlands as well as purchasing limited edition Sparkle Troves for a chance to win an Onyx Unicorn. I actually have both of those mounts and each comes with its own unique glitter trail while running thru Telara. The Onyx effects are purple and the Opal effects are rainbow colors in random patterns. Don't miss out this event ends on Nov. 26th.