A local workroom asked me to make a pillow for one of their customers; they had seen a sample of the type of pillow at a drapery industry conference a few years ago.
The filler for the pillow is a standard 8" x 20" cylindrical bolster, but it finishes out as a square-ended bolster! It's not difficult to make; just a bit fiddly.
There are size pieces: four rectangles for the sides, and two squares for the ends. The sides are sewn together with contrast cording to form a tube. Then the same cording is sewn to the end squares.
For this particular pillow, the ends were hand-sewn onto the body of the pillow (with the form in place). This allowed for precise pattern matching.