Here is one lovely example from Etsy:
Here is the finished product:
I used the entire suit of hearts and every bit of the three kinds of ribbon and most of the red ribbon. This is so easy to do!!! Just punch two holes in each playing card and string them together with the ribbon of your choice. (we chose red) Then, we cut lengths of the three Valentine's ribbons and tied them together between each card. It actually looks cuter in person.
Since I have another set of cards, I may make another one!!! And you can repurpose the other cards for things like mini-canvases (just gesso over the card) or mini-journals.