I just finished a rag quilt and used 4" and 8" squares of batting in it - - all from my scraps. Didn't matter that they were not all the same type, either. I've also used them in smaller projects - mug mats, pin cushions, small zippered bags, placemats. If the pieces are fairly large then I might try to piece two together to use in a lightly used/laundered item such as a wall hanging, table topper, etc. There is also a fairly new product on the market to fuse batting pieces together. Have not used it yet so don't know how good it is. Still have too many batting scraps though because I hate to throw any away.