WoWDB

Mylune's Call, when used, creates an area of grass and flowers around the player. It also has falling drops of water, tiny birds and butterflies flying in it, and a fawn. It also has a few sound effects. It's quite pretty to see and hear. Well worth the gold I spent.

Edit: It costs 3,500 gold without any reputation discount. It is around 2,800 gold with the full Guardians of Hyjal reputation discount. The vendor is only accessible if you have unlocked both Druids of the Talon and Shadow Wardens, and complete the quest Calling the Ancients .