I would save them in a special box. I am also an oil painter. If you have interest in designing and making art quilts, these tiny scraps are just like the last dab of paint to complete a painting. Something you would never make a trip to a store to get. There's a use for just about anything these days. The key is to have an idea, and follow through with it. You can use your quilt color experience to make a beautiful fabric "painting."
I see you're in Texas - go for it, girl! That's just me - I recycle glass jars to hold leftovers in the refrigerator too!