This is about the closest we ever get to the stereotypical 'homeschooling at the kitchen table'.
Jello Play Dough
1 cup white flour
1/2 cup salt
2 tsp. cream of tartar
2 Tbsp. vegetable oil
1 cup water
1 (3 oz) package of fruit flavored gelatin dessert in your choice of color (We made 3 batches: raspberry, lemon, and berry blue)
Dump all of the ingredients into a medium sized pot and heat over the stove on a medium-low temperature.
Each batch makes about 3 or 4 of the commercial containers of play dough, and smells lightly fruity but without a very strong scent. It is also completely non-toxic as all of the ingredients are edible.