Released first in Germany in February 2010 and then around the rest of the world, the Blank Card is the Dominion Card inventor's/Print & Play fanatic's best friend. It was released as a promo paired with the treasure card "Stash". Several player's enjoy making their own cards and release them to the public via Boardgamegeek.com or other website venues. One of the most popular Print & Play Dominion fan expansions, Fairy Tale, was the first to utilize and promote the use of the Blank Card.
For those of you wanting to use them, you have limited choices. You can print stickers of your created/printed cards and throw them on the Blank card (recommended/hard way); or you can print them off on normal paper and throw it in a card sleeve with the Blank card and no one will be the wiser (it works/easy way).