This was done compleatly with torn rubbings:
First, I walked around with loads of yellowish paper and a graphite pencil and rubbed on anything..from felt, to tree trunks, bricks, sand, iron grids, non slip steps, concrete, a woven basket etc, which gave me a whole range of interesting patterns.
I then drew in a landscape quickly, tore little strips from each rubbing and stuck them into the picture.
I used the ridges from the torn pieces of paper to create and complete the picture in charcole..not too bad. It worked. now am going to elaborate on that and create the same landscape in different colours