We had a great time cooking the dough then smashing and mixing the color in. Annie loved tearing it into tiny pieces that were super fun to clean up. She made a snake, and when I asked her what his name was she said, "Thomas Kaye Mounts." The recipe is pretty simple and makes a nice textured dough (not too grainy like salt dough). It does leave a film on your hands, but washes off easily.
2 cups baking soda
1 1/2 cups water
1 cup cornstarch
Mix with a fork until smooth. Boil over medium heat until thick. Spoon onto plate or wax paper and mix in color (if desired).