Just kidding ! It's tempting to make art from trash and I've been known to do it when the mood strikes. An artist friend of mine who invites visitors to his studio started getting requests to buy his thickly encrusted palette and they fetched $75 each. I must say that they were quite unique in color and texture.
I collect the styrofoam containers (discards shown above ) that meat comes in to use as my palette of acrylic paints. It saves a lot of time and effort in cleaning up. I just discard it when I'm done. I can't remember the last time I bought a palette.