Granulat was quite widely used material for decorations during 70/80s. I discovered it now 😛
Basically one uses a heat-resistant form for placing the granulate inside. when you are satisfied with the form and colors, put the granulate for 15min into 180C oven.
When the form is cool, the material will separate from the form itself. really easy!
I applied creativ-granulat for the drawing robot 🙂