I just did a pin cushion. The directions said to use wool. I had leftover batting from one of my quilts. So I cut it up in odd sort of small pieces. I liked it. Would do it again. I do have a bag of emery grit that I've used before. It's pretty heavy. Don't think I'll use it too much more. Would not recommend those plastic pellets, coffee grounds or walnut shells (which I have also used). I collect vintage and antique pin cushions. When I get them sometimes they are pretty ratty and need a new top.