Thanks everybody! When my kids were little and in CLOTH diapers (dates me eh?) I would run the diaper pin thru my hair. The natural oil on my scalp would actually lubricate the pin and make it "sharper"! That is probably why OLDER cushions are made of human hair. Think I'll stick with the glass beads (or sand) sugessted here. I usually make with uncooked rice but read on the QB that it will get bugs - hence the question about filling....