I included black crosshairs to make cutting them easy.* They would make great postcards, or provide a nice colorful surprise to a recipient if placed in a simple homemade envelope. Use magazine pages or plain red/pink paper to make the envelopes. Check out the free download for the vintage valentine's day cards here.
Now, getting away from Valentine's Day, these would make AWESOME invitations, save-the-dates or RSVP cards. You could simply white out the "To My Valentine" line and replace it with a text box with you and your partner's name on it! I may even make a sample at some point and share it here. If you have any questions about how to insert a text box, contact me, I'd be happy to help.
* On some printers, the cards print with a white border on the outside. Just cut that white part off to make the card look symmetric in border color.