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.
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.
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.