I read about a digital drawing app called Sketchpad in @shortcut's post New Digital Artwork: FOMO [Get yours!], he creates some amazing artwork using its tools. I decided to go give the app a try, it has some really fun tools and brush styles.
Creating a cityscape
I tried out the sketchy drawing brush, creating as series of lines to form a city skyline.
Very quickly I had built up a series of buildings using the drawing tool, and the mark making the sketchy tool made gave the impression of shadows.