Rainbow Fish by Marcus Pfister is one of the most popular books I see in elementary school libraries. Kids love the cool illustrations and glittery cover.
LearningParade has an eye-catching craft activity designed around this book. Students create a tissue paper lantern that closely resemble the colors associated with the popular book series covers. Students can also work on a cut/paste activity and color their own rainbow fish in this printable sheet from the site.
As an added bonus, check out MrsRojas's story maps made with post-it notes! They are just the right size for a little story analysis for students. She's even included a printable sheet to include information about different story elements.