The bricks are quite simple to do. They just take a bit of time.
We started of by sanding the boards flat. We then used a craft knife to mark off the stone work. We then used a blunt pencil to scribe over the cut line to open them up a bit. We then use a rough stone, pressed into the foam to make it look more like stone and give a better surface for painting.



To do the bigger areas we split them into smaller sections and then filled them in. It makes it more managable. We also scribed in some cracks using the knife and pencil method.
Hope that helps.