I think this would be totally Rad
Water Sprite Theme
Webbed feet that come in different colors to match different skin tones (Blues, greens, normals..) water related stuff, green or blue mermaid tails, a pond (sorta like the little pond in Blood Lotus, but only bigger! Like you're standing in the water...It's not behind you or in front of you, but you're actually in it!)
(Could also be cool to have a waist deep water.. XD)
Dragon Theme
Scaled Skins, dragon pets, dragon wings, dragon background, eggs
Pet Companion Theme
More animals!! Wolves, dogs, more kitties, ferrets, petshop like background, pet toys, more leashes, foxes, ect..
Pirate Theme
New pirate hats, background with ocean/ship in distance, another pirate boat background, new swords, funny beards (think Captain Jack Sparrow!), piratey makeup, piratey clothing..