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hello mercer, I think it will be difficult to make a long-lasting clay from cornstarch and sand, but if you're in a dry climate, probably possible. I bet you can find some instructables about it (https://www.instructables.com/id/How-to-make-clay/, https://www.instructables.com/id/Making-Clay/)it looks like these folks may be able to help you make clay flowers too! https://www.instructables.com/id/Easy-Clay-Flowers-for-Beginners/, https://www.instructables.com/id/Clay-Flowers-101-to-/
Arduino Chandelier from Jars
3d printed puzzle
Create faceted papercraft-objects