I've started doing a basic graphics mockup for a Wizard of Oz map. It will be based on the original Baum map of Oz, and will have four "continents" that are the Gillikin, Munchkin, Quadling, and Winki countries, possibly with sub-bonuses for areas inside there. The Emerald City will definitely start as neutral, and holding it will either be a bonus in itself or possibly a win condition. The witches will have something with them, either they can attack each other or there is a bonus for holding some witches or something.
I'll have a mockup posted by the end of the weekend.
Note to those that care: The Wizard of Oz is in the public domain, and has been for 50 years