In between of making more cushion covers for the boat (yes those are still unfinished) I made three tetrahedron bags for Likka to play with. The tetrahedron bags have dried peas inside. These as many other of my crafts was inspired by Hupsistarallaa. Norsis had made similar for her son over a year ago. The pattern is from hääräämö blog. I tried to find similar pattern for you in English, but with a quick look I could not find one, so the pattern link is now just in Finnish, but the pictures are pretty good, you might not need it in English anyway.