I have used dimensional triangles in my sashing making friendship stars using the corner stones. I have also used 3-piece striped sashing where the center stripe is one of the fabrics in the quilt. I got real ambitious on one quilt and the quilt blocks went from dark to light and I matched the outside strips to the block they were adjacent to with a consistent color in the center and the corner stones were little 9-patches whose 3 edge blocks were opposite colors. The stripes were 1 1/2" wide cut and finished at 3".