variation on link, thanks to some random guy I met on an airplane years ago: take cereal boxes, cut out a square, glue a photo you like to the printed side, and turn the plain "inside" into the stationery side of the postcard.
Previous pinner said, "Cereal box organizers! what an awesome idea to recycle those cereal boxes! I REALLY recommend this project i have made 4 of them and i LOVE THEM! they keep my mail organized and you can designe them according to your home decor.
Make a Christmas Village with Recycled Boxes and wrapping paper -- free printable windows. This is a great craft project that the whole family can work on! And it's a great way to recycle your old cereal boxes and scraps of wrapping paper.