This is a really approachable clay project for high school students - and can be done for slightly cheaper than bigger projects (like the boxes in my shop). It's much quicker too but still gives them a great experience with clay.
I do this with my grade ten art class to connect it to Greek art history.
It asks them to create CLAY RELIEF tiles based off mythology (of course you could limit this to Greek myths/Roman/Native American...whatever suits your class).
I like to keep it open since students connect with many different time periods.
Included in this mini bundle are:
-The project handout (includes a review of the 3 main types of relief)
-A page with images of myths from different religions and cultures, just to inspire them with imagery and cool stuff
-A rubric to make marking easy (includes two short reflection questions for them to submit with final project, for communication marks)
-A quick Powerpoint that goes through the 3 types of relief/slip and score technique/notes on texture (again, just to inspire them!)
These turn out awesome, and are super flexible. You can do it with just GEOMETRIC/ORGANIC shapes, have them stick to one culture's myths, have them do triptychs with 3 tiles...can be easily tweaked to fix your class needs.