Just today, I began mailing my fiance puzzle pieces...I bought 4, 13-piece, heart-shaped blank puzzles from the craft store and drew with markers on one "Happy", another "45th", another "Birthday" and on the last one, "I love you!".  He'll be getting one (or two because of the puzzle-piece count) puzzle pieces in the mail from now until his birthday on June 19th, when all pieces of the puzzle can be put together for the message!