Years ago, I ordered 12 of these 8x10 canvas panels from amazon. These canvas panels were mainly for practicing, I don't usually paint pictures with acrylic paint, and they have been great for practice. They have been painted over and over with layers of paint and are perfect for playing with the kids.
When the canvases and scrap wood dried, Jimmy and I got out the spray paint and played without the kids. I can definitely see myself doing this again. Not only was it a lot of fun, but I think some of them turned out really neat.