Some limestone blendeable materials made 100% in Substance Designer out of the same graph. I created them for a future project I'm working on in Unreal Engine 4.
For the setup inside the engine I created a material that allowed me to add all 4 materials to any surface making use of the awesome vertex painting feature. To get a better result I added some extra tweaks to the blending material to make it feel more organic and natural.
Vertex Painting Demonstration