Here is the card (they all have the same background):
upper right crop:
^Looks like a couple skulls on the bottom, upside down. If you move up and to the right you can see plenty more, plus there’s one of those weird demented looking elves near the top, sort of like:
upper left:
lower left: (top right of image, two big ol alien eye sockets!)
lower right: (upper right again, plus all sorts of other vulgarities)
previously in subliminal advertising: