Pillow Mattress. I made this for my four year old. The total cost for pillows and pillowcases was about $25. I got the cheapest pillows and cases I could find. I wanted the bed really poofy, so I cut the pillow cases down to fit more snugly around the pillows. The result is a very poofy, soft pillow bed that my little girl loves!-woder how these would work for us?