I acquired a few gunmetal satin drawstring bags in a recent purchase of 1:6 scale doll heads. You can easily find such bags in a variety of sizes in craft supply stores or online shops in the category for weddings. I guess people often put favors [Jordan almonds BLECH!] in them.
Anyway, I had some foam from a previously acquired doll package, so I cut a section of it roughly the same size as the drawstring bag. Then I stuffed the foam in the bag. Look — a pillow!
Lastly, I snipped the drawstring parts and unthreaded them. Isabel then appropriated the pillows to take a nap.