I decided to be an Avatar this year. I just wore a brown swimsuit top and a blue swimsuit bottom. I made the loin cloth out of Fabric from Hobby Lobby ($1) and brown Yarn. I cut the trips of fabric to fit my size body and just glued it with fabric glue and tied it on the side.
I was airbrushed to get the color of an Avatar and I purchased Avatar ears and used latex paint to put them on. Used a Mr. Clean sponge and darker blue paint for the stripes.
Eyes: I purchased the contacts on-line (prescription) :)