I also dust with them and attached them to the dry mop.
I use a piece of about 12 inch square to lay out the block pieces to sew together. Keeps all the little pieces in place. same as the other posts; smaller projects and piece some together.

I cut them into rectangles and use them as dry dusting cloths for my Swiffer to give the floor a quick sweep. They pick up so much thread, dust and pet hair it's almost unbelievable.

Smaller pieces are great for dusting TV's and electronics. Won't scratch like a paper towel possibly could.

I also use small pieces of batting to make easy quilted cosmetic bags when getting ready to sell things at craft fairs.

I too use them on the Swiffer and have just thrown them in the washer and dryer and they do fine.

I use mine to stuff yo yos and then make Christmas ornaments out of the yo yos. I like all your ideas.

I use the small as stuffing for small projects or children's costumes if needed, restuff dog beds, larger pieces stitch together & use for small quilts or wall hangings.