Since I have to take medication the rest of my life, I have a gazillion perscription bottles. I rinse them and then use them:
To store broken needles
To carry needles and/or pins to class
To sort and store buttons
To carry bobbins to class
To hold several pre-wound bobbins for quilting or class
To hold or carry anything little that usually gets lost in that back
corner of the drawers or boxes.