Ruby Submarine.Currently listed at $6.20 USD. It's a beautiful pattern with lots of pictures. Very easy to follow.
The pattern calls for chunky yarn but with my little green octopus I used worsted cotton, 3 and 5 mm crochet hooks. I filled the head with long rice (not instantaneous). The idea was to make a magic bag/stress ball. It's kind of too small to be a magic bag but it works as a stress ball though. I'm exploring squishier, more stress busting options for the next one I'll make.