FamilyEducation.com has recipes for modeling clay, baker's clay, bread clay and other types of clay. Each of these recipes call for ingredients that are commonly found around the home.
The modeling clay recipe calls for 2 cups of salt, 2/3 cup of water, 1 cup of cornstarch and 1/2 cup of cold water. To make the recipe, heat 2/3 cup of water and the salt in a saucepan for four to five minutes before removing it from the heat. Stir in the 1/2 cup of cold water and cornstarch until they are smooth, then return to heat and stir the mixture until it thickens. Cool the clay, then model as desired. When the clay model is dry, paint or color it with markers and seal the design with clear acrylic spray or clear nail polish.
For baker's clay, mix 4 cups of flour, 1 cup of salt, 1 teaspoon of alum and 1 1/2 cups of water. Separate the clay and add drops of food coloring for colored clay. Model the clay, then bake the pieces at 250 degrees Fahrenheit for 30 minutes. Before baking, you can place wire in the models to make ornaments or use cookie cutters to make shapes. If desired, paint the figures and seal them with clear nail polish or acrylic spray.