I am sure you can find cold porcelain recipe easily online. I tried more than 5 recipes as suggested by others before finally I settled down with my own recipe.
I didn't invent this as it was there. But I did a little bit of experiment with material compositions. The result? I could say I have almost unbreakable cold porcelain clay.
I threw my half finish figurine to the floor from about 1 meter high and it stays as it is - no broken shoes.