For manufacturing, we need a solid whitepaper (photo paper, for example), green colored paper, scissors, glue and a stationery knife. First, we print this PDF-document on white paper, cut it on the contour and add it in half. It turns out a postcard with the markings outside. Next, we cut out of the green paper exactly the same size of the postcard and paste it inside the existing one. After that, we should get a book with the outer side white and the inner side green. Now the most difficult and responsible stage, you need to cut out bent triangles (except for the bottom part) with a stationery knife or any other tool. We cut through like white and green paper. After we fold the triangles outwards and get a pretty green herringbone on the outside of the postcard. In the card you can also paste additional sheets and decorate to your liking.