I am new to Blender, dabbled a little over a yr. Recently reinstalled it. I been picking up fast. My question is, how do i add detail to a roof and wall. 
I wanted to include photo of what type of details i was talking about, for better understanding. Is this possiable to do in blender 2.68. If anyone can link me a video tutorial or maybe a screenshot of the progress.
I learn and understand it better seeing it done then rather reading it.