This is where it gets fun.
Draw some basic shapes and add some spiky lines, fuzzy lines, wavy lines and some smooth lines.
See how you can make something look fuzzy? How about we make some drops or a puddle? Make the lines wavy.
Check out this piece. I used curvy lines to imitate grain on a piece of wood. Now I used a combination of values and shading to create the effect of bricks on a wall. The same for this tiling on the floor. Experiment with different formed lines and see what other forms of texture you can create. It’s also a great warm up exercise.