Battle of the Skies by Peri Gordon, 11

Clouds jaunted cheerily through the sky as they headed for their destination. They traveled in their various friend groups, smiling as they drifted through their lush, blue field. Some of them waved to the sun as they passed by, others were small and shy and tried not to be seen by the majestic, golden king. Then from the west came a terrifying cackle, and the most horrible beings came forth. They were much too large and puffy and wore the ugliest shade of gray. They drove back their innocent cousins, dressed in white, until no more of this pure color could be seen. The cackles could be heard again, along with deep, resounding war cries that demanded power. The white clouds were no longer in sight now, banished from the area, probably so sad and miserable that they had become rainclouds, sobbing over the world in great sheets. They had lost yet another Battle of the Skies.