There are a lot of kits that you can really make work for Disney World. (I have annual passes to WDW, so I have lots of pics. lol) For instance, a jungle themed kit is great for Animal Kingdom.
A kit with a tropical theme always works on Florida pictures.
A movie themed kit can work well with Hollywood Studios.
Another idea is a kit with lots of black and red. Since Mickey and Minnie are pretty much red and black.
Hopefully this gives you a jumping off point to find some great stuff for your Disney photos.