Here's the Lesson 4 section for my long sampler.
(click on photo for bigger image)I was concentrating on 'density'.
There's arrow stitch, german knotted and up and down buttonhole, (up and down buttonhole is another great stitch for curves), arrow stitch variations (changing direction of the stitches) and cretan stitch.All further embellished with french knots, lacing, beads or sequins to build up the density.
And this is a little experiment with running stitch:
(Click on photo for bigger image)Done on Aida with perle cotton.I can see lots of possibilities for lacing here, but the point was to use one very simple stitch.