After reading this book with the children we re-created our own big green monsters! I had the children start with a piece of white paper (I folded it in half) and blue, green and purple washable paint. Each child got to plop globs of paint onto the paper then fold over the other side to cover the paint. Using their hands they pushed the paint around underneath the paper until they were happy with how it looked. I loved how each one was a little different- making every monster unique, just like them. :)
Once the paint dried I cut out the faces and let the children decorate them using the parts of the face as described in the book. They loved how their monster's faces came out and so did I!