Something I've not seen done too often is showing anime with a reworked opening theme during a rebroadcast. Apparently the rebroadcast of Tatami Galaxy did just such a thing this year! I really like both the original opening and the remake.
They used a completely different ending theme for the rebroadcast, but it's not as good as the original ending. Man, I still love to just turn on this song randomly every now and then. I get little chills listening to it.