RKN:
Love the pic!
How about ME AND MY SHADOW!
Or a Witch and you could sing I PUT A SPELL ON YOU!
Dorothy--"Goodbye Yellow Brick Road"?
Bunch of Grapes--"I Heard It Through the Grapevine"? Or the same song for the California Raisin (remember the commercials for the CA Raisins that used that song? I live in CA, incidentally).
And yes, the idea of the "Paradise Burger" costume (even though the sites that sell it say it's for men) and "Cheeseburger in Paradise" has occurred to me :-) (Buy Costumes no longer has this one for sale, incidentally)
Here are other ideas I've though of:
http://www.coolest-homemade-costumes.com/unusual-halloween-costumes.html#c7
http://www.buycostumes.com/Gold-Digging-Girl-Adult/20951/ProductDetail.aspx
What could go with any of those?
All I can think of right now.