This is a simple version of fly stitch.
The first step is to sew a foundation row of fly stitches.
Turn your work and sew a return row upside down superimposed on the foundation row.
You can use threads which contrast in weight or colour. The stitch can be worked in a line or rows banked one upon the other to create a pattern which ideal to fill a shape. Pairs of this stitch can be effective too as fly stitches can be scattered to make a powdering.
For further embellishment sew a seed bead to the center of each pair.
This is a version of Reversed Fly stitch is simple and easy to work and effective worked in a number of threads particularly threads that have been over dyed.
First work a row foundation stitches in fly stitch. The return row is also fly stitch superimposed upside-down on the foundation row. In this version the tail that ties the fly stitch is short and the first row of fly is wider than the second. It produces a pattern that can be used as a border or built up row upon row to create a design that can fill an area.
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.