1. Used lint roller sheets. When they won't pick up lint and stuff anymore off my quilt tops, I use them to wipe off the flat surfaces of my sewing area, window sills, lamp shades. They still have enough stickiness to work. Might try it on the cat next!
2. Empty flushable wipe boxes. The ones with flat tops are the best. I use them for storing small quilting and sewing notions. I print out lables for the contents or use a permanent marker either on the top or sides depending on how they are stored.
3. Used fabric softener sheets. I am a gardener so I save them until I have a bunch and then sew them together creating row covers for my garden. I use thread from almost empty spools and bobbins. You would be surprised at how much row fabric you can create with these dryer sheets. I have not tried this, but a few might be used to add to stuffing for pillows and toys.