I find that colorful things around me make me happy and more productive. I use colorful Valentine's Day cards to mark different sections of my notebook. These little valentines are just too adorable as bookmarks or for children to pretend they are playing cards.
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I've been saving used and unused Valentines for several years. Now I can cut out parts that I like to use, and put them on homemade Valentines. When my granddaughters didn't use all the her cards in a child box, I kept them. Glued them onto blank cards. They make a cute card to send to young and old alike!