Confession - Our wedding had a theme. The theme was "inside jokes between HP and Roxy." And the theme was subtle enough that most people didn't even notice. We were happy to explain it to anyone who was interested though.
Note though, that our theme was about us. We were not recreating some movie or book (although weddings of readers that feature books is not bad, but you are getting married, not characters in a book). So I've gotta say, I agree with this article: Don't have a Hunger Games wedding
I particularly liked this quote:
"By the by, this goes for you boys with your flash-mob, social-media, and Muppet-inspired proposals, too. The most powerful, ballsy move in the world is looking a woman in the eye and simply asking her to spend the rest of her life with you. Everything else is a cheap stunt."
Maybe it's the introvert in me, but the power of the proposal is the energy between the two people, not the stunt and crowd that surrounds them.