David Malki (who does the wonderful comic Wondermark) and his wife were both working in movie advertising when they first got engaged, so they made a promo poster and movie “trailer” for the wedding. Their wedding cake was action movie-themed, and it is utterly awesome. You can see the cake, trailer, and larger version of the movie poster here.
If you’re looking around for a wedding theme of your own, this would be a really fun thing to do. You could obviously go gothier with a vampire- or slasher-type “movie,” and use the motif for everything from invitations to reception decor. I just love the originality and whimsy of this idea, particularly because there are so many ways to tie it in to various wedding details.