This is a version of Reversed Fly stitch which is simple and easy to work
First work a row foundation stitches in Reversed Fly stitch (version 2).
A second contrasted thread is then whipped along the central spine as illustrated. As you move from stitch to stitch, do not pass the needle through the ground fabric. Use a blunt ended tapestry needle for this part of the process to avoid splitting the foundation running stitches.
The thread that you use to weave with, can be a metallic, a fine cord or fine ribbon of contrasting colour. Experiment with contrasts of texture and weight.
Beads, French knots or Colonial knots can also be added to this stitch for a more decorative effect. The stitch can be worked in a single line as a border stitch or along a seam in a crazy quilt or rows can be banked one upon the other to create a pattern to fill a shape.
There are a number of varieties and developments of Fly stitch. These are listed under Closed fly stitch, Plaited fly stitch, Reversed fly stitch, Threaded fly stitch, Threaded reversed fly stitch, Whipped fly stitch, and Whipped reversed fly stitch.