Took less than 5 minutes. I simply taped some grosgrain ribbon on the bookshelf and used clothespins to hang the cards. Since taking the picture, I've added more ribbon and more cards. That's what I love about it - as your collection of cards grows, just add more ribbon and more clothespins! This would look great on a blank wall too!
Note to self: Straighten the books before you take a picture of the bookshelf next time. ;)
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