So back in W3 there was a special Easter scenario called Bunny Island, which basically is an. Island inhabited by humanoid rabbits called "bunnies". What if they added Bunny Island in WoW, with you getting there in a way similar to how you reach the Isle of Giants. Maybe you can do some simple quests for both Easter and just other times and maybe they could even make a Dungeon on Bunny Island. I don't know I just think it would be hilarious, especially how Blizzard would make them look in-game (rabbit worgen?). That's just me though.
http://wowpedia.org/Bunny_Island