Moo.com is known for selling customized business cards that allow you to place a different photo on each one—and they can also be used to create a card-matching memory game for kids. The company's former vice president of marketing, Lisa Rodwell, ordered 50 cards for her niece and nephew and had pairs of family photos printed on one side. The kids shuffle the cards, place them photo-side down and take turns flipping over two at a time, trying to find the matching pairs.
