This is an digital storybook generator and worth exploring for the classroom. I would write about it to describe it for you, but the video provided by Storybird does a much better job. You will need to register an account. A free account limits the number of stories that can be generated per student to 3, but this is probably sufficient for most. You might assign one or two practice stories (assessment for learning), which can serve to guide your followup instruction, and then assign the final story (assessment of learning) for the literacy mark.
Storybird (Art Inspired Story Writing) – How-To Video