1 part Hair Conditioner
2 parts Corn Starch.
Add some food coloring for diversity.
Since not all hair conditioners are the same consistency, you may need to alter the amounts just a bit so it is dough consistency.
Think of this as a mix between playdough and cloud dough. It is light and airy like cloud dough, but molds better as the conditioner helps the cornstarch become more pliable. - More ideas from the Kids Activities Blog