I made one but it wasn't as shaped. I just made a big rectangle and sewed up the sides. It works very well. I also have one that I bought at a computer store and it's just about as good, but not as firm.
I also did a crochet border and that made it look really cute. I think it was a picot edge with a crochet hook. It's really small but adds a little interest.
Next time I might buy another rest and make a cozy for that. I really prefer the firmess of whatever is inside this stuff. It was about $10.00 You could use flaxseed for a unique feel too, but I'm super picky