I love receiving (and sending) greeting cards. The thought that someone did his/her best to pick out the right card for you in a shop, wrote down a message, put down your address on the envelope, licked the stamp and walked all the way to the post office, just to send you a sweet and private message.... This will never be replaced by e-cards in my opinion.
These are a few "jumbo cards' that I designed for Hallmark. These sure are fun to give away!