To make a beaded warped square in Peyote Stitch is very easy. Especially if you know how to make a flat beaded square. In fact, a warped square is easier than a flat square!
Technically speaking, we are using a combination of Peyote Stitch and Herringbone Stitch.
The logic is: Peyote stitch for the flat surfaces; Herringbone stitch for increases.