11. To say, “Look at this gorgeous card I found.” Don’t keep something that pretty to yourself.
12. To congratulate someone on a new car. Butter them up for when you inevitably ask to borrow it.
13. To celebrate Thanksgiving. No one sends “Happy Thanksgiving” cards. Be unique.
14.To celebrate the Fourth of July. If they’re American, it’s sort of a second birthday card.
15. To congratulate someone on a promotion. If appropriate, maybe include your résumé.
16.To wish someone good luck on an upcoming surgery. Not that you need luck or anything. You’re in very skilled, capable hands.
16.To share a recipe. Add one tablespoon of friendship …
18.To wish someone a happy anniversary. Sticking to milestone years is boring. “Happy 17th Wedding Anniversary” is unique.
20.As a joke. Sending your 45-year-old friend three “Happy Quinceañera” cards will get a laugh.