When kids sit down to model a tractor out of Play-Doh, they're using wheat to do so. Flour is a key ingreident in allowing the modelling compound to be stretched and manipulated by the user. The 1965 patent for Play-Doh suggested using hard winter wheat due to its high levels of springy gluten. People can make homemade Play-Doh by using water, salt, flour and vegetable oil.