not quite what I meant by unique. you do have to have some sort of attachement to them, but you don't have to make them your self or have them commisioned, just a deck that kinda calls out to you. Everytime I go somewhere that happens to have tarot decks I notice the Tarot of the Cat People. you don't have to only have one deck, because cards wear out after a while no matter what they are. my mom has had quite a few of the Toth deck.
If Telltale/Lucas Arts decided to make them into real tarrot cards, more power to them. and who knows, maybe some people will have the whole connection with Tarrot of the Voodoo Lady. More Power to them too. at this point your best choice is making them yourself. but just a few hints if you do; Guybrush as the fool, LeChuck as the Devil, Gabel/Galeb/Vicky/Nor Treblig as death, and Elaine and Guybrush together as the lovers. really sounds like they would work, eh?