Well, a lot of people have seen it already, but my favorite theme deck is my Undead Pirate deck, also known as my Pirates of the Caribbean deck. The basic foundation is 2 Pirate King Dub Rido and 3 Skeleton Warrior, plus 2 Shades to make your opening work. Bazgar's Soul Skill makes the Warrior strong early, and Rido keeps him self-reviving forever, plus gives you infinite shades. Then just contain your enemy and make him waste his Grimoires and Soul Skills as best you can, until Dub Rido dies. After that, do any Falkow endgame you wish. I recommend keeping Lawtia at 2 (and use the level 2 Grimoires).
considering its a theme deck it's strangely effective... well, I guess it's more of a theme opening than a theme deck.
"Scissors are overpowered. Rock is fine." -Paper