This clay painting video is really incredible. I bought the $99 one from Pyramid...yikes, but well worth it. I subsequently found the version containing the 4 shorts for $20!!! at the Oregon College of Arts and Crafts gift shop. Maybe folks could check a museum or university store near them to purchase it!
The Vinton site also has clips of her chimerical work (Wishbone salad dressing, Microsoft etc) Joan Gratz is listed in the "House" portion of the site and then look under directors. Will Vinton Studios (renamed Laika last year) created the California Raisins and the claymation series The PJs.