Avatar Costumes & Avatar Halloween Costumes. There's blue fever in the air and it's all because of AVATAR! Avatar costumes will transport you to another planet where theres a wonderful world of magical beasts, spirit trees and blue inhabitants. Morph yourself into Neytiri of the Navi tribe or Jake Suelly for a party or work event. Get your kids in on it while trick or treating this Halloween, it will be out of this world!!