After reading the book, engage children in a rhyme matching game. Print out sets of pictures that feature objects that rhyme; for example, a hat and a bat, a mouse and a house, a log and a frog and a boat and a goat. Place one set of the rhyming pictures in a face-down pile and spread the other set of pictures on a flat surface, face-up. One at a time, children take a picture from the pile and try to match it to the image that it rhymes with on the floor. If the child makes a correct match, she keeps the pictures; if she is incorrect, she passes the picture from the pile to the next player, who then tries to find the match. The player who makes the most matches wins.
Practice making patterns with red and blue fish. Cut out several images of red and blue fish. Use the fish to create a simple pattern; red, blue, red, blue, for instance. Ask children if they can use the fish to repeat the pattern you have made. Make a few different patterns and ask children if they can identify the patterns. For example, if you've made the pattern red, red, blue, red, red, ask children which color fish should come next in the pattern. Have students to use the fish to practice making their own patterns.
Create fish bowl crafts using children's handprints. Provide children with paper plates and instruct them to color the top of the plates blue, creating the look of water in a fish bowl. Set out red and blue finger paint and have children dip one hand in each color of paint. Have them press their handprints onto their paper plates with their fingers spread open. Provide them with googly eyes to glue onto the upper portion of the palms, creating the look of fish.
Have children create a page that could be added to the book. Encourage children to think of silly things that rhyme and encourage them to write a sentence that includes the rhyming words; for instance, "Have you ever eaten a sub in a tub?" or "The big jet went to bed wet." Stress to children that the sentences don't necessarily have to make sense, nor do the words, just like they often don't make sense in the story. Have them illustrate their sentences and assemble the pages to create your own version of a silly rhyming book.