Playdough!

If you've never made your own playdough, I highly recommend it.

Here's a simple recipe:

1 cup flour

1/2 cup salt
1 cup water
2 tablespoons oil

Mix flour, salt and oil, and slowly add the water. Cook over medium heat, stirring until dough becomes stiff. Turn out onto wax paper and let cool. Knead the playdough with your hands until of proper consistency. Use as is, or divide into balls and kneed in a few drops of the food colouring of your choice.

Have some cheap homemade childish fun!