Fancied making my own pencil brush and here we are. I created the marks for the shape source with some black paint applied with stiff card. The grain texture is the inside of a cereal box.
I also played around with some slightly different settings and created a more subtle version (Josh's Pencil 2).
If you are having trouble downloading the brushes I made a youtube video on how to do it;
https://youtu.be/CgcqUfVAp7o?si=OHi_J4CDwULqJVf0