Gluten-free Coffee Ground Clay
Coffee ground clay will not dry hard. Though it looks like an ordinary clay, it will crumble if manipulated too much. It makes nice (but temporary) coffee grounds castles.
1 cup dry coffee grounds (fresh or used)
1 cup cornmeal (gluten-free)
1/4 cup salt
Let's make it
Combine the dry ingredients. Add enough water to make a dough. Have fun.