Make someone's special day even happier with an adult birthday card. Convey your warm greetings in a sincere way with designs to celebrate any milestone, from the excitement of turning 18 to the achievement of reaching a century. Go cheeky with a funny cartoon, pick a more sophisticated image, or plump for a photo capable of conveying a range of emotions. Find blank cards and tailor your message personally, or let the text speak for you. Brands include reliable stationers Five Dollar Shake, Cardmix and Woodmansterne.