DIY 3 Ingredient Sand Clay Recipe from Paging Fun Mums. Easy recipe that you mix and bake. Bi carb soda in this recipe is just baking soda and you can buy sand at any home improvement store.
DIY Sand Casting Tutorial. This is a really easy and cheap project (I did this as a child using a milk carton, then carved the Plaster of Paris creating an abstract sculpture I still have). Tutorial from Honest to Nod here.