There’s a big list of plastic canvas patterns, over 125, available from Craft Stew. The list has been collected from all over the Internet, and all are free.
They are listed by name according to categories. Click on the name to go to the site with instructions.
Many of the patterns say “link” after them and, as near as I can tell these go to pictures of the project on freepatterns.com. The pictures aren’t linked to instructions, so I’m figuring you need to go to their homepage to find out how to get the information.
Thanks and a tip of the hat to Denise at Craft Gossip.