Whether it’s a card front topped with an idyllic winter scene or a funny illustration that makes you laugh, resend it as a postcard. “For this idea to work, the back of the front flap of the card needs to be blank,” says Kayla Hutchinson. “You then cut the front flap of the card off.” Just be sure that the remaining card is at least 3-½” high x 5” long x 0.007” thick, which is the regulation set by the U.S. Postal Service. Bonus: The mailing cost cheaper for a postcard than a letter stamp.