I'm still getting used to them, but as you can make quite nice organic-feeling brushes out of them, I'm probably replacing bristles to scatters on many of my main brushes, though this batch might not have the brush that was just right for me. I made a bunch of them to familiarise myself with the mechanics. I believe Sai version implemented scatter brushes, so I only got them today as I finally updated my Sai first time after summer. The configuration files are out-of-date but still work nonetheless, at least up to version 2020.06.17. Note on newer versions: you can add the files to both 'brshape' and 'scatter' folder as is to use them for both the scatter tool and regular brushes. Just hit the download button above (hopefully it works, haven't shared brush files like this before!)