This is a landscape using imagination.  We were asked to draw a line then exchange the paper with a partner.  The partner then had to think of a picture using the line that was drawn.  So the
picture that I saw in my line was that of a mountain range.  We were then asked to add details to our picture so I drew a few more mountains, a river with fish swimming, the sun and some clouds. 

As an extension activity, I could use this lesson as a supplement to an English lesson.  If the students were reading a book, I would ask them to draw a line and then pass the page to a partner.  That partner would then have to come up with a picture, using the line drawn, to create a picture based on the book.