For quilting: ideal for making quilting images with flowy lines.
For embellishing: Appliqué with rounded shapes can be made easily. Free hand of set lines can be marked out for techniques like embroidery with beads, ribbons and cords.
For adjustments: Especially suited for making rounded shapes and transferring patterns or free hand drawing of necklines, armholes, hiplines, etc.
Adapting existing patterns by adding designer lines or changing straight and bent lines. The with of the rules compares to a seam allowance.