Pattern?

How about simple hatches? You divide the area into small partial areas by eye size and shade the first part. In the second part you turn the direction of the hatching by a clearly noticeable angle. In the third and every other part, you twist the angle so that it differs from the neighboring surfaces.

You can use the different web and stain patterns to fill the area. There are massive Parkingwith which you can fill areas. In addition to the simple calculations, there are many periodic patterns. In addition, there are non-periodic patterns, such as the Penrose parking. The latter work with two different “cachels”, which can be put together to form an infinite surface following certain rules.