Writing challenges are a great way of shaking things up. They also allow students to be creative with language.
Here is an assortment of challenges I use with my students.
Writing Challenges Ebook:
Writing Challenges Google Doc:
https://docs.google.com/document/d/1qL7A1ocDzXOEQgdvaA67QxN93M97EuHbns9EbxYpRGk/edit?usp=sharing