Jasart - Polystyrene Shapes Polystyrene shapes offer a basic structural form to build on and create your crafty project. Ideal for making faces, baubles, or to simply paint, pin or glue on embellishments! Can be painted for astrology class or used as armatures (frames) onto which clay can be modelled (they enable economic use of air-drying clay). Available in a variety of shapes and sizes. Take a look at our Creative Active Kids Collection and at the Jasart Kids Collection!