Why cell foams?

Now why would I be trying to look for cell foam? Well, I had a rather artsy idea occur to me. Last weekend I scored my family desk and my grandmother's sewing machine. I always wanted to try it and whelp it was here. Adding onto this was my nearly destroyed pillows. The stuffing had long began to fill out but the pillow covers themselves were still good. I always had the plan to resew them together and salvage them. But now all the stuffing is either gone or ratty. Getting the foam stuff I linked could solve this little problem.