I've been meaning to do this for ages. We have a bunch of plain white towels. Boring. I bought several spools of the Martha Stewart twill tape at Michael's a couple years ago with this project in mind for the sage color.
A nice improvement.
For those who are interested: The trim fit within the decorative band that's woven into the towel. I folded the ends of the twill tape under at the edge of the towel. An edgestitching foot with the needle moved away from the center put the seam right where I wanted it. Sage thread was used in the needle and white was in the bobbin.