Write your message. The first rule of postcard writing is, there are no rules. Write as much or as little as you like. Don’t write at all but instead draw a picture depicting your favorite moment of your trip thus far. It really is up to you. Some people choose to write as much as possible, filling up the text area, then writing along the bottom, up the right hand side, upside down along the top, and on down the left side. Go wild so long as there is space to write your recipient’s address. Here are some ideas about what to write about