Doodling is good for you. It’s a kind of mindfulness, I think, or meditation. And best done when you’re not thinking about the drawing. This woodgrain doodle is a good one to start with. It’s something you and a child can do together, even working on opposite sides of the same doodle.
Start with a ‘nearly straight’ line – maybe a child could draw this. Then it’s a matter of drawing a line as close as possible to that line, slightly exaggerating any bump or dip you come to. A woodgrain or hair effect soon emerges. You can add a blob if the dips get too dippy. If you want. Have fun.