Then I started thinking about ideas for designs for my car and the club etc. anyway, I'll quit stalling...
calling card: one side is a jack of clubs, the back is a simply designed patterned back (like most cards) except with the club's info in one of the corners.
decals/logos: you have one card with its back facing forward, with a second card - the jack of clubs - slipped out to the side so you can just see the letter and clubs symbol strip down the side. (will see if I can pull up a image later)
then you could have the clubcj tag on the back of the card in front.
anyway, I'll try and draft up some images later of what I mean, I just needed to post this up - anyway back to work.

[edit: some draft pics found on page 2]