You will need
A pen and paper.

Steps

1- Put your pen on the paper, close your eyes and move your hand around however you like to draw a squiggle on the page. 

2 - Open your eyes and have a look at your shape, move the paper around and explore your squiggle from different angles. What do you see? At first you might not see anything much, thats ok. Keep being curious and as you do little pictures might begin to emerge in your imagination. Perhaps you see and animal or a mythical creature, maybe it's a landscape or a little scene.

3 - Once you've found something draw into your squiggle to transform it in to the image you see.

You can't get this wrong.
There is no right or wrong way to do this.  It's ok if you find this difficult. Whatever you feel try to be curious. Observe your thoughts and feelings as you take yourself through this exercise.