I have not made one, but it's a formula that my grandmother used frequently for those odds and ends that were long narrow "strings" of fabric.
she would make them frequently into triangles or other shapes and sew together.. she would take old newspapers, cut a stack of shapes and stitch "strings" to them, trim to shape and stitch together. then remove paper from the back.. she called them string quilts or spider web quilts. This is also the type of quilt that scrap quilter's granddaughter Breanna is learning on, using the scraps we send her..