Make Rough Walls in Photoshop

[RobA]

Here's a step by step using the random coast method.

Start with the areas blocked out:


Select the areas you want to have rough walls and blur:


In a new layer set to Overlay, fill with turbulent clouds with as much detail as you can get:


Copy visible, paste and apply curves (serious S curve) or threshold to get the shape (or in photoshop use a threshold adjustment layer, I think):


Pretty it up:


-Rob A>