They are a combination of Tunisian
Simple Stitch and Tunisian Purl Stitch, together sometimes called Tunisian
Honeycomb Stitch. In the picture above I have made them in grey/red and
grey/grey. In the picture below they are done in light/dark grey and then in
the reverse dark/light grey. I do Tunisian crochet in the round with a double-ended crochet hook.
You can find more and more
information about Tunisian crochet on the internet. Below is a link to more
information about the Honeycomb Stitch. I haven´t been able to find
instructions on how to do the Honeycomb Stitch in the round, but if you do it
flat first you will soon understand how it works in the round.