|Recently, I made some large bolster pillowforms for my couch. It was a great way to use up the little bits of batting I had saved from other craft projects.
If you use batting as a backing for your pillowforms they'll keep them looking smooth, not lumpy. Just cut the batting backings and baste them to the pillowform fabric. Then sew and stuff. You can fill them with polyfill, batting bits, or shredded foam and still have smooth pillowforms.