Pic. 7. I use the leftover strips of 3-4 inch muslin from backing a quilt and small strips of scraps and make piano key strips. I will trim them when I am finished and someday there will be a quilt that calls out for a funky border. Or I could use these strips to just make a quilt with solid strips in between rows. One could always have a braid strip going too with the same method. When you trim off corners and have triangles, they work great for using on another scrappy square where the last piece needs to be a triangle shape.