To just design a card, no. Just print screen instead of giving them all your personal info.
There are criteria for actually getting a valid card, among them having a valid Capital One account in good standing, as well as having an image that doesn't have explicit content or otherwise violate copyright. You also have to give the card back if they find your image in violation after the fact.
For now, it's mostly just fantasizing about how awesome it'd be, given the tantalizing real possibility of actually owning/using such a card.