At each of my shows I've demonstrated this technique and usually refer knitters to another source on line for a video. Today I've made my own video--I'll likely redo it and improve it, but it's a start.
Look at the Zombie Shadows colors for the Three Zombie Shadows Projects, a hat and 2 cowls. I've also used this technique in Geek, the lace weight, alternating between single strand and triple plying: Navajo Ply Cowl, done in simple feather and fan stitch.
So here is my first video, Navajo Ply Knitting by Lorna Miser.