I absolutely love the Boo and Baa books by Olof and Lena Landstrom (which aren't easy to find!)! For Christmas I made a Boo doll to give with Boo and Baa Get Wet, with the help of a (free) Shaun the Sheep pattern by Abigail Gonzalez.
I changed the colors, adjusted the arms and legs a bit, and improvised the little overalls.
For the crochet specifics, I used Hobby Lobby's I love this Cotton Yarn and an E (3.5mm) hook. After I started I was a little surprised with how big the doll was going to be, but I think it still turned out pretty cute!
If you are a big Shaun the Sheep fan (which I am!) you should check out Abigail Gonzalez's cute pattern!