So apparently you can put a pringles lid on them perfectly and then use them for portioning out sliced fruit

I use one as a water pot when painting war hammer.

I use them for depositing olive pits or other fruit detritus, or for dipping condiments like balsamic vinegar

selling them on ebay

You can keep mini screws in them when you dismantle consumer electronics in the vague hope of one day replacing the broken part.