Do you have a theme? Where is your reception being held? Does your 4 tables include the head/sweetheart table? While we just did numbers these are some of the combinations that we considered (some changes for WDW as we were DL):
How about:
Characters: Mickey, Minnie, Donald, Daisy...Goofy, Pluto
Lands: Fantasyland, AdventureLand, Frontierland, Tomorrowland (for you two), Main Street, Toon Town
Rides: Tea Cups, Small World, Peter Pan, Cinderella's Golden Carousel...or any other ride combination
Imagine, Dream, Inspire, Create, Love, Wish, Magic,
Parks:Magic Kingdom, Animal Kingdom, EPCOT, Hollywood Studios, Typhoon Lagoon (if you need a 5th)
Couples: Mickey/Minnie, Donald/Daisy, Cinderella/Prince Charming, Ariel/Eric, Aurora/Phillip, Snow White/Prince, Aladdin/Jasmine, Belle/Beast, Peter Pan/Wendy, Clarabelle Cow/Horace Horsecollar, Robin/Maid Marion,
Movies: Sleeping Beauty, Cinderella, Little Mermaid, Snow White, Aladdin, Beauty and the Beast, 101 Dalmations, Peter Pan, Great Mouse Detective, Pete's Dragon, Robin Hood....