Once you’ve mastered a basic rolled hem, you can use the same stitch to create a variety of decorative effects and trims. To quickly and easily add lace trim, place the lace straight edge along the fabric edge with right sides together, and then serge, catching both edges in the rolled hem stitch.
#DIY Scallop Hem Skirt. Here's are the instructions for the "paper method", BUT I'd really recommend that you use the LARGE SCALLOP STITCH in your Baby Lock Sewing Machine. Instructions are in most of the Baby Lock Inspiration Guides, AND IT WILL QUICKLY give you a crisp, finished-look scallop edge.