When I used to quilt on my DSM I had very few choices of decorative stitches. I found stitching right next to the ditch to be a great solution. I varied from 1/8" to 1/4" away from the seam lines using my foot as a guage. I could only do this with smaller size quilts because it involved turning the quilt quite a bit. I wouldn't attempt it with anything much bigger than 60" square. I would also mix in handquilting for the more elaborate designs because I never felt comfortable FMQ on my domestic. Here is a link to a quilt I did both these techniques with:
http://www.quiltingboard.com/picture...ar-t25770.html