Affordable DIY Kiddie Treasure Stones I saw this on a PBS special called Kids Concoctions. Recipe: mix 1C salt, 1C flour, 1C used, rinsed coffee grounds, and 1/2-3/4 C water to make the dough. Shape into balls and hide "treasure" inside. Bake at 150-200 degrees for 20 minutes or air dry in the sun. We called ours pirate treasure but you could also roll them in glitter and call them princess stones. I hid them and the kids hunted for them. Would be great for birthdays!