There is an Alicorn that was made available through The Elves Storyline, the Rainbow Alicorn. We don't really craft it so much as we have to complete trades (that offer random amounts of either Bronze, Silver or Gold Runes - sometimes all three) to collect the required Runes which are then used to purchase the Alicorn in the Rune Market.
Here's a link to the Elves storyline thread that should have all the details to give you a fuller picture of how it works:
https://forums.storm8.com/showthread...-Outpost-Runes