[ThisisDog]

A method I'd read about previously involved printing directly onto the blank cards. The idea is, you print the image on to a sheet of paper, then stick a blank card over where the image is printed, and run the same sheet through again, so the printer prints the image onto the card.

Another method I'd heard is to print it on clear sticky-back plastic, then stick that onto a blank card.

A lot of people on the internet have claimed that these both work, and with an inkjet printer at that, but I can confirm I've tried both on a Kodak printer and the ink has bubble up and not taken properly both times. Still, food for thought.

Edit: If my memory serves, the cards are 88mm by 53mm (or 63mm, but that sounds a bit too square), but I could be wrong. That should help with you sizing.