I know the majority of the members here collect modern decks and there are only a few "Vintage" collectors, but I was wondering if anyone collected individual/single cards? I would assume the back designs, or the AoS and Jokers would be a bit of a draw. I've seen some on eBay for a $1 or 2 with some very cool designs.

I guess they're also called "Swap" cards? If I'm confusing two things please let me know. I need to add to my collecting list like I need a hole in my head, but I do head out to antique malls once a month or so, so I was just wondering if there were any "Educated" members on the topic.

Yes!  I collect single vintage playing cards!  I also buy full decks, keep the ace of spades and jokers and then swap or sell the rest to other collectors.  Many collectors hate people like me because I am splitting up the deck, but I collect them for both the artwork and the thrill of researching where and when the card came from.  The ace of spades usually has a special stamp or code which can be researched.  Research can also be done on the design of the aces, the royal cards and the joker.  People do refer to them as swap or trading cards.  I believe the idea of swap cards came from medieval times when artists used to create works of art the size of a playing card and swap them with other artists.  It was their way of learning new techniques and styles of art.