Create Items Using a Classic African Style Stitch
4) Continue adding two beads at a time around the ring, using herringbone stitch.
7) When the bead work is the desired length, finish the final round by stepping-up into the second-to-last bead. Stitch down through the third bead, and up through the fourth, pulling tight with each pass. Continue around the tube until each bead is secure.
For more ideas and inspiration, see this tutorial on increasing flat herringbone weave: