I wanted to do something to teach the kids about God's definition of love, so I made a poster version of 1 Corinthians 13, and a bunch of hearts. For the month of February, whenever we notice someone else doing something loving (as defined below), we give them a heart to put on our little tree.
The kids LOVE hanging the hearts, so they get quite inspired! It's also a great way to praise them for good things they do, and get's them to acknowledge good in each other. Love can be shown in so many ways that, once you're on the lookout, it's not hard to find something to reward, even for the little ones.
If they start pointing out something good they did (yes, it happens) then I remind them they are supposed to look for something another person has done. But I try to be diligent to watch myself, so I can give out hearts and make sure everyone gets some.
It's a very fun way to celebrate Valentines Day, add some seasonal décor, and encourage lots of love in your home.