I made this today. I found the directions online. My daughter helped make it, since it is for her soon-to-be-born son.
It is filled with Polyfil and is washable. It measures 8" across. I used scraps from my quilt stash - the black and white ones are from my daughter's quilt.
If you want to make one, go to www.about.com/od/babyshowergiftsewing/ss/babyball.htm