Sorry about the delay. Wasn't expecting to get that last one. I think this should be a fairly easy one. "With this candle I will set your mother on fire."
The brown stains leaking under the window sill are decals. The blue paint paint coming off the brick and the patches of damage around the windows on the top floor is probably a vertex blended material.
Also in my opinion probably too 'clean' looking as an ally way, needs garbage/detritus of a sort strewn about and perhaps just a few graffiti decals on the walls or props as well?!
Usually it's a layered approach. The main surface will be tiled and then extra information will be applied through decals and texture blending based on various masks - some of which will be unique, some will be tiled at different rates.
How do you get it to work with Windows Ink and NOT have that stupid circle pop up? That stupid delay is killing me. Running on Windows 8. Also, the constraints are freakin awesome!!