This is a concept which is being considered and the idea is to use real bone, essentially a waste product from agriculture which would otherwise be incinerated.
Yeah this is not a real product, I am student currently investigaing applications for waste bone from agriculture which is currently incinerated - at great cost to the environment and agriculture. This image was created in order to see how people would feel about bone being used in objects - leather is essentially cow skin after all. Please post your thoughts on the materials.