There are tons of costumes out there. I'll give ya sum ideas.
Girl - Cowgirl (drools), Nurse, Genie, butterfly or fairy, mystic dancer (with something like long skirts and tons of jewerly), Michelle Branch

, lifeguard... *thinks of some more*
Boy - Nerd, Soldier, Harry Poter (lmao), KISS group member, wizard, Big chilli (hehe), Pirate, Police Officer, Navy... I can come up with some more if you want, hon.
There, I hope this helps
