I remember making salt dough ornaments as a kid. This method, using baking soda and cornstarch looks interesting: Dries quicker, smoother and whiter than traditional salt-dough Cups Water 2 Cups Baking Soda 1 Cup Cornstarch
This homemade clay recipe only takes two ingredients and 10 minutes! 2 Cups of Baking Soda, 1 Cup of Corn Starch, 1 Cups of Cold Water. it is so much cheaper than the store bought model magic! Air dries and can be painted.