The walking foot for your machine is quite reasonable (about $20-25) and easily available. You can do gentle curves and straight lines with a talking foot. If you do some gentle curves from one point to another to make it look like it's turning over? Just use the edge of a big plate or pot cover or pot or whatever is the right size and some type if marker to mark the line. For straight lines, painters tape. Be sure the marker will wash out. Test it ahead of time.