A combination of Houdini and 3D Coat trying to beat Quixel at the stuff you can't really scan.
If this looks disgusting enough to be commercially appealing I packed it into a product on my store. Bring in the gore!
It's all heavy high-poly with vertex painted textures in 3D Coat (best software at high-poly texturing) Then I set up some simple tri-planar shaders in Blender.