It’s one of the better “big” birthdays, so mark the occasion by sending 21st birthday cards from Zazzle! We have funny 21st birthday cards, typographic birthday cards or sophisticated 21st birthday cards. Choose from folded cards, flat announcements or postcards or even send a photo card. Pick an existing design from the Zazzle marketplace and add names and details, or create your own design from scratch. Find other birthday cards on our birthday cards page and all types of greetings on our main cards page.