Erm, hello, sorry to butt in or anything but, erm, I was told about this thread by an acquaintance after mentioning I was working on a Caroc deck for next year's con, if you're still looking for artists I'd be up for it, I think, though I would be drawing in a more classical Tarot style to the submissions I've seen on the thread.
Looking at the cards on the first post, just one thing: The Star and The Pool of Night are shown as separate cards in the books, I believe, and possibly instead of the Wheel of Fortune how about the Butterfly of Chaos? Just an idea.
I like the idea of Rincewind as the Hanged Man, as it is a man hanging upside down rather than a man being hanged on the Tarot card, and Vimes as Justice seems right, and perhaps rename the card "the Law"? Other cards might also warrant re-naming to fit the Discworld theme, such as Hermit to Sweeper, and since the Caroc has thirty major cards there might also be room for some additions such as The Witch? Also I had Nanny Ogg and Cassanunda pegged for The Lovers, but each to their own.
I'd been toying with the idea, for the cards I'd been working on, of having the four decks have different themes -- wands are clubs, like a truncheon, so have the king, queen, knight and page of the wands suit as Carrot, Angua, Colon and Nobby, Octograms are the symbols of wizards so perhaps instead of king, queen, etc. have Archchancellor, Dean, Bursar and Ponder? Uberwaldian characters for the elephant suit because of the fifth elephant, and for Turtles, well Lancre is near the hub so perhaps Verence, Magrat, Shawn Ogg and Shawn Ogg (yes, twice because he has many different roles in the castle)?
Anyway, be glad to know what you think of the ideas and if you are in need of artists still.