Draw shape with chalk, slice a perpendicular equals sign (=) every inch and a half or so along the line with an x-acto knife, weave ribbon through, leaving a length before the first slice and tie a bow.
Old sweaters ~ Cut sweater straight across under the sleeves through both front and back. Measure the width for pillow form. Turn sweater inside out and sew a seam at the top. Turn right side out. For bow closings, sew two equal-length ribbons just inside the open end of the pillow cover. For a closed end, insert the form and hand-stitch closed.