For me, I would try to avoid the movie theme, it seems to be the quick n easy way without too much thought..Just wack on some licenced pics and away you go!
(says he with what was 3 licenced 'movie theme' pins in his collection)...

Timeless themes such as cops n robbers, car chases, aliens invading earth, space / time travel,  with lots of strobes, awesome music and some thoughtful toys appeals to just about everyone.  Also a game has to have a goal, to win (with a few easter eggs along the way!) rather than just a flipper bash scoring points.