I would love to create sand mandalas with a class.
I did it when I was in 6th grade in Tokyo, Japan after studying Tibet.
I would hope to teach about Tibetan culture of sand mandalas, watching videos of the process and studying the process (summative assessment on why the people use such temporary materials).
Then we would be able to work on patterns, and lines and shapes, as well as symmetry (math).
Students would design and sketch their mandalas, pick a favorite.
Draw on a larger scale and color, then finally, create sand mandalas on wooden boards (to try to move safely between classes). Possibly would need an "in school field trip" and have the students create the mandalas in one day.
This would go great as the students are learning about different religions in Social Studies.