In Cloudette, by Tom Lichtenheld, a smaller than average cloud is happy and well-adjusted to her life in the sky. Being small gives her all sorts of advantages such as cute nicknames, great hiding places and the best view of the fireworks. But when the big clouds sail off to create storms and to water the fields, Cloudette gets the urge to do something big and important, too. So off she goes to find a job.
She could work at the firehouse or the garden center or even at the car wash. But nothing works out until she comes across a dry, barren patch of ground that used to be a pond. Cloudette has an idea! She puffs herself up until she becomes a rain cloud and finally discovers a job just right for a little cloud.