I really enjoy when businesses incorporate their main service or core concepts into their designs. It sets these companies apart while also providing a further way of involving the customer in their product, especially when the designs are made to be interactive. Not only are they given the information needed to get in contact with the company/representative in a playful way, but they are able to actively participate in the “creation” or manipulation of the product at hand. Beyond this, it is possible that such cards serve as conduits for feelings of personal involvement with the company which  may help to increase the notion of relationship the customer experiences with them (thus increasing their probability of continuing to interact with that particular brand).