Lorna's Laces Bullfrogs & Butterflies Ahah! was developed with Lorna's Laces by Cat Bordhi. Cat had a discontinued ball of yarn that she used to show stitch behavior in her classes. Her students always asked where she got the yarn, but of course, since it was discontinued, had no where to point her students to, until now . This single-ply yarn is easy to manipulate and has a color sequence that makes it easy to distinguish stitches. Keep a ball of this yarn in your stash for when you have to practice a new technique.