Once washed they can become handy little containers for small items. I cut these down to three inches tall, and as you can see, twelve of them fit nicely inside the lid of a box. You could make them any height you like, and if you have a bigger box you could put more of them in, maybe 15 or 2o or more. If you had a hobby that you needed to store lots of small parts you could cut them to fit inside a drawer.
I'm not sure what to put in these yet, I was thinking of sorting out my nails and screws as they are all mixed up in a big tin, it takes me ages to find the ones I want. Or I might put my buttons in them. There must be loads of ideas you could use them for.