He uses anything and everything,His piece for his exam was an underwater scene with a shark bursting out of the top of the picture that he carved out of expanding foam,expanding foam was used for the breaking of the water at the surface and for coral,it is an amazing piece
He also carved a skull out of a thermalite block
As i say you really have nothing to lose there is no obligation,just email a picture of your pet and he will do his stuff,he does some amazing things with a biro aswell.
I showed him the pic.I had put on and he said why did I put that on as its rubbish
That was done with my 8 year olds poster paint