I save all my batting scraps to use as stuffing and they can be sewn together with a large zig zag stitch and used in something bigger. I would not recommend a bunch of little ones for large quilt but they work well for small ones.
Also it makes good stuffing in soft animals etc for kids and dogs.
I have also used a small piece pinned to my shirt to put the thread tails on as I stitch - keeps them off my pants. Some quilters put a piece down next to the machine for this but I like the one pinned to me better.
You will continue to have scraps of fabric and batting.. and I think they make the best quilts.