I’ve recently upgraded my desktop publishing skills and I’ve been able to produce several passable custom card decks for Wings of Glory.
Besides your computer, you’ll need a scanner and an inkjet printer, garden variety graphics software like Paint and Word, and sundry office and craft supplies that can be found in the big-box stores or ordered online. You’ll need a custom design for the backs of the cards.
It’s a non-trivial amount of crafty work, and I’d rather buy my cards tailor-made. If you can’t find a suitable card deck, you might consider making one yourself.
You'll shoot your eye out, kid!