If you do a lot of hand stitching, you can’t help inventing new stitch variations occasionally. There are lots of variations on basic stitches, and many ways to combine one basic stitch with another.
Here’s an interlaced/woven running stitch/blanket stitch combination, which looks best in two colours:
You need to work a row of running stitch first, keeping the stitch and space between stitches as even as you can. Then you can work a blanket stitch into the gap, using a different colour, and weave through the running stitch to start the next blanket stitch.
A simple enough idea, and easy to stitch. It probably needs a better name though, combining blanket and running. Blanning stitch. Runket stitch. Oh dear me, no. Suggestions on a postcard please.