Michael Moscrip, the Grumpy Old Troll, mentioned Tarot card reading in D&D in a Google+ post a few days ago. It just so happened that I have written an article about this very thing for Fight On! #6. Here is the original version (it was cut slightly for the magazine).
You can, according to some occult writers, make perfectly valid Tarot card sets based on almost anything. King Arthur, cheesy soft-porn Vampires, cute liddle kitty-cats, all kinds of bad taste baloney has been employed, all you really need is a basic knowledge of the Qabbalah, the flexibility of mind to fit stories and images to the 22 paths of the Tree of Life and the lack of moral compass to market such tosh to the gullible.
I had a go at this myself many years ago in an effort to persuade a hippyish girlfriend to come back down to planet Earth by showing that any piffle could be turned into tarot, and created the bare bones of a 60's Pop Culture Tarot; the arrest of Mick Jagger on drugs charges was number 20, Judgement, Ken Kesey's infamous bus was The Chariot, The World was The Trip - I lost the notes many years ago (probably used them as rolling papers), but you get the idea.
In the article I mention a Carcosan Tarot, which Jeremy Duncan, the Dandy in the Underworld, said he'd like to illustrate. What other Tarot decks might be fun to inflict on unsuspecting gamers? Could they be turned into game aids you could sell?