My boys got playdough in their stockings for Christmas this year. We really needed some new playdough, and I found a recipe for one that made fantastic rubbery playdough without me needing to modify it at all. If you want to add color or scent, add it to the mixture at the beginning. I added red food coloring and peppermint extract to one batch so it would be candy cane playdough.
No Salt Rubbery Playdough
2 cups baking soda
1 cup cornstarch
1 1/2 cups water
food coloring, etc.
Whisk all the ingredients together in a saucepan until the mixture is smooth and one solid color.
Bring the mixure to a boil over medium heat, and stir until very thick and smooth.
Place the mixture on waxed paper and allow to cool.
Store in an airtight container.