I don't have a pattern but I've seen a wallhanging done with corners, remember the black sticky corners we used to use in our photo albums? If your pictures were all 4 x 6" it would be fairly straight forward to draw up a design, but most school pictures differ a little. However if you decide to try it you would just need to cut say 2"squares, fold them on the diagonal forming a triangle and place one on each corner of a 4 ½ x 6 ½" piece, raw edges matching, then incorporate that piece into a wallhanging of your own design.....clear as mud?