When I taught Ancient Greece and Greek Myths, I taught it as a thematic unit with our reading groups and writing assignments.
The students brainstormed and created their own creative Greek Myths after we'd spent our unit analyzing the elements of a story and the lessons learned for the Greek Myths we read as a class.
In addition to just creating their own myth, they also got to choose HOW to present it to the class. With audience accountability and them asking questions like "What was the name of your god?" and "Where in Greek was your story set again?" at the end of the presentations, it helped all students practice being reflective and set goals for future growth.
I was truly impressed and surprised at how creative they got in naming their gods and solving a problem. It's a fun way to end a unit!