truebluemeandyou: Really excellent detailed tutorial. I’ve used all sorts of things to make candles from milk cartons filled with ice cubes to sand. For sand casting with plaster of paris go here: truebluemeandyou.tumblr.com/post/23198124103/diy-sand-casting-tutorial-for-kids
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.