What is a good Bible story to tell to kids?

I am in fine arts at our church and I am wondering what is a good Bible story to tell to kids the catagory is Childrens Lesson and the age is 6-12 and the theme is This Changes Everything. I have to fit the story into the theme. If you know any good bible stories then tell me please. I am running out of time. Thanks!

Noah’s ark. God promised never to destroy the earth with a flood again, he gave us the rainbow in symbol of that.

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