Persuasive writing: The neat thing about this book is that on the last page, the author leaves the end of the story up to the reader! Have kids write persuasively to convince the kid to either save the ant or squish it.
I like this because it fits the opinion standards too. writing standards ask for an opinion writing with reasons why not persuasive. They don't have to try to convince someone to feel the same way or provide the other point of view!