Italian border Stitch is great for borders and edges. You can work this stitch where you would normally use buttonhole to finish an edge. Worked in a compact manner it forms a neat line with the knot re-enforcing the edge.
Since this stitch is actually a variety of fly stitch it is very versatile. Italian border stitch can also we worked in a line, arranged in patterns or worked in a circle to create disk like flowers.
With this stitch you can easily add beads. Since the stitch can be opened out to form a V there is countless geometric patterns too. You can also use it to hold down a thicker thread or ribbon or weave a thin ribbon through the spokes.
I have also seen another variety of Italian knotted border stitch documented in Encyclopedia of Embroidery Stitches, Including Crewel by Marion Nichols, which has a second row of French knots worked along the top of the open sitches
How to work Italian Border Stitch
Italian knotted border stitch is actually a variety of Fly stitch and you begin the stitch in the same way.
Bring the thread through the fabric out at the top and to the left of the line that is to be worked.
Insert the needle a small space along the line, level and to the right of where the thread first came out.
With the thread wrapped under the needle, pull it through the fabric.
Secure the stitch in position with a small knot.
To do this you need to wrap your working thread once around the needle and insert the needle at the base to tie down the stitch.
As you pull the needle to the back keep the tension of working thread even by guiding the thread under your left thumb like you would a French knot.
Continue along the row in this manner