Be careful. Some walking feet will only do straight stitches, they won't go backward or do decorative stitches. Check before you start experimenting with these. You can always do the gentle curves. There's a book that has info on this this technique: "Foolproof Machine Quilting: Learn to Use Your Walking Foot - Paper-Cut Patterns for No Marking, No Math - Simple Stitching for Stunning Results "
http://www.amazon.com/Foolproof-Mach...chine+quilting