Here is a speed-sketch I did with a marker and a Japanese brush pen. It was raining and I only had a couple of minutes so it's rough as guts but I quite like it.
I have been messing around with trying as few pen-strokes as possible to construct a drawing - this one ended up being three strokes in total - you can try and trace them with your eyes if you like - then I used a bit of the rainwater and smeared some ink in and around the lines. Going to try some more of these and see how the results evolve!
Aidan 20/3/15
The Argyle Courtyard, The Rocks, 20/3/15