For me, they make great little thread and fabric scrap trash boxes to sit beside my sewing. They are portable, so I can take them with me to classes or sewing functions, which means I don't need to locate a trash bucket to use when I am out and about. Since there is only batting inside, they mash flat for transportation, or can be used to carry supplies. I used the instructions from this site to make my first one, but then I saw a picture somewhere else that showed the little pockets on the outside of the boxes, rather than inside. Both are just too cute for words! :o)
Below are my boxes. The red one was made as instructed by Seaside Stitches. The blue one is the one I made with outside pockets. To make it, use the instructions for the original box, but sew the corner seams with wrong sides together, then flatten the flaps up against the corner and tack in place.