Thanks for the tutorial, the resulting effect looks pretty good!
One thing that would improve it is better shading/texture on the fractured polygons.
It would be better if they could have the same or similar shader/texture as the surface polygons and have some modelling so the fractures don't appear so flat.
Any ideas how this could be achieved?
That all depends on which plugin you use to fracture the objects, most will allow control of the textures inside and out, Tharusi i think allow for a noise based deformation of the inner surfaces