Check out the all the Crystal Snail Mounts coming in Embers of Neltharion.
Blizzard is adding new Crystal Snail Mounts to the game in Patch 10.1. Currently we only have the source for the pink variant. The rest remains to be added over the course of 10.1 testing. You can find al the available tints below.
Blue Crystal Snail
Green Crystal Snail
Pink Crystal Snail (Big Slick in the City)
Red Crystal Snail
Yellow Crystal Snail