Sometimes when I'm done with a project, I have just a little bit of paint left in the can. I don't want to toss it, in case I need it for a touch up later, but the cans take up a lot of space. So I've started saving glass containers that beverages come in. I use Goo Gone to get the label off, and then I clean them and fill them with paint.
A little hanging label tells me where the paint was used, and on the reverse, the paint brand, name and color number. I should be able to fit all my paint remnants on one little shelf now, and they're so much prettier to look at.