The picture I linked is of a buckwheat pillow. Had no idea they were a thing before today.
What about silk or bamboo pillow cases?
I’ve only ever really used cotton pillow cases and cotton stuffed pillows. I recently upgraded to a foam pillow that I’m enjoying.
Have you looked into mattress materials, too? I bought a latex mattress a few years ago, which is pretty good and should last, but I’ve always been curious about other options.