Couching is this week's stitch from Sharon at www.pintangle.com I often use it to hold down a cord as the basis for a design. It is easy to manipulate into whatever direction necessary.
The top line is held with just a diagonal straight stitch. Next an exotic yarn is held in place using the Herringbone Stitch.
The green thread was so fuzzy that I left it do its own thing and just tacked it with small stitches using Perle Cotton 8.
The blue is a yarn that I crocheted into a chain stitch and tacked with the Perle again.