Cobblestone - Procedural Material

Fully procedural cobblestone surface I did trying to force Substance Designer to finally listen to me :).
I picked that type of surface as was experimenting with rock's collisions and intersections.
I started with random pattern coming from 'Cells' node as main rock shape generator and built entire material logic over it. In result I get substance which also builds same logic over any other pattern I use as main shape input. I think this is where Substance Designer really shines.