Mary’s found a good use for empty takeout containers:
I don’t know when Chinese restaurants became my "Tupperware" hookup, but takeout has been coming in much better containers lately. My favorites are these rectangular plastic containers with clear lids that snap on tightly. I was using them happily as leftover vessels, but when I was visiting my parents recently, my mother gave me back one of my containers that she’d lovingly washed and saved for me thinking it was something "real." I’d brought my daughter’ magic markers in a Ziploc bag for our trip, and was pleased to see that they fit in the container perfectly. The clear top lets you see what’s inside, and the top stays closed even if it takes a dive off the table. And? It was the magic price. These would be great as sorters and containers for all sorts of art supplies and "precious" things.
I also find that the round containers from the bulk bin section of our natural foods grocery come in handy for all sorts of things.