I am so glad I looked at this thread today. What a great idea!
I have saved some of these containers so that when I need to send home leftovers with a guest I don't have to give up my good Tupperware or Rubbermaid stuff that never seems to come back to me. These containers look great on your shelf and they have holes in them (or most of them) so that your fabric can breathe. Also could be a great way to package a gift of fabric for a friend. All you need is a pretty ribbon and you're done. Some of the LQS use them to make "lunch boxes" or "cinnamon rolls". And the tall drink containers like we get at McDonald's iced coffee in have been used for "milk shakes", latte colored fabrics. I will definitely look a little closer when I go to Costco or the supermarket. Always great to find a new way to reduce, re-use and recycle. Everyone wins!