Stem stitch is a beautiful rope-like hand embroidery stitch that works great for writing with a needle and thread. I need to remember the direction to stitch in!
23 Weird But Awesome Knitted Things
Variation on a raised stem stitch
Daisy Stitch Flower with Two Colors tutorial
It's called a guilloche stitch.
Woven Filling in Embroidery ~ Add some intricate texture to your next embroidery project with needle weaving