This was such a fun process - thanks for another great class, Jamie!
For the scatter brushes, I used some ink paired with a toothbrush, cotton swab, torn piece of foam brush for stamping, and an old spray bottle for splatters.
To make pattern brushes, I drew some lines with a China marker, Neocolor crayon and charcoal pencil (I can't remember which one I ended up vectorizing...)
I have made a few vector brushes in the past, but Jamie had some great tips that I hadn't seen before, which made the process much easier!
I brought the scans into photoshop and adjusted the levels. I used the lasso tool to draw select only the marks I wanted to use and dragged them over to Illustrator where I used Image Trace to vectorize.