Here's a little video I did for The Sketchbook Challenge. I enjoy these games and my students like them as well - from kids to teens to adults. Games like this are great for loosening up and training your eye. As you watch the pen move across the page, you begin to learn to control it. It's great practice!
Here's the finished drawing. I used pen, and then black ink and a brush. You can read more here on the Sketchbook Challenge blog.