I will often doodle with a pen or pencil both of which are adequate to produce a simple tonal drawing. Occasionaly I will add some colour; doodles are particularly useful for trying out new materials. Small intuitive abstract designs can look more interesting than some well thought out large scale drawings. The colours in the image below do not adhere to any particular colour plan but are fairly cohesive as they are all from the same brand of gel pen colours. Doodling or Tangling is a creative exercise with no direct aim other than the enjoyment of doing it.