I came across this very useful exercise shared by Visual Thinking Expert Dave Gray, one the most important Visual Thinker and Writer. Check out this short video presentation and read the explanation below.
"Squiggle birds is a quick exercise that you can use to get people stretching their visual thinking muscles. It takes about five minutes and quickly, clearly demonstrates how little effort is really required to make meaningful, easy-to-read images. The main point of the demonstration is that our minds are already pattern-making machines, and very little drawing is actually required to convey an idea. The mind will fill in the rest."