"You make my heart POP" valentine for the spouse/significant other. OR you could offer individual bags of microwave popcorn to your children's class mates for Valentine's with the saying- "You make my heart POP!
365 reasons why I love you jar. Both have their own jar and write once a day one thing they love about the other. On their anniversary/birthday/valentine's day/christmas/whatever the occasion, open the jar and read what the other person wrote