I have done this exercise a few times and really enjoy it. I use it as a way to relax and feel grounded. I find it calming and fulfilling. As you can see it isn't about the beauty of it, the value is in the process. This is how it works. Close your eyes and listen to the sounds around you. With your eyes closed let you pen move across the page in response to what you hear. When you are ready, open your eyes and image each sound as a colour. Use markers, crayons, coloured pencils, or watercolours and add these colours. What do you notice? I hope you give it a try.