The instructions say " With just a pencil, lollipop stick or ball-point pen, any child can 'cut' a block". I tested it and it really is that easy.
My fish bone print. I hope to use this with a pottery dish I am going to be making for my cat.
A random heart print. I am not sure if I like this one. I may work on this one a bit more.
Personally, I would prefer that the print could make an indentation rather that be raised but I imagine I could reverse the print using an alternative medium such as a molding compound or polymer clay.