Harry and Horsie by Katie Van Camp and Lincoln Agnew
This is the current favorite book at our house. It was featured at story time at the library (with a theme of bubbles) and Zboy was entranced. It has a horse, rockets, and bubbles-all things he loves. It has fantastic illustrations, and a wonderful story. When researching it, I saw they have also done another book, "Cookiebot-A Harry and Horsie adventure". That will be going on our wish list as well.
This is a book I would definitely recommend buying if your child like any of those things, and if you're a fan of vintage comic-type illustrations. Zboy will love getting it for his birthday.