I hadn't seen it shared before, but I came across a Tumblr page dedicated exclusively to SAI brush settings for various uses:
http://ptsbrushes.tumblr.com/" onclick="window.open(this.href);return false;
disclaimer: this is not my personal Tumblr page/account, and I am in no way affiliated with this page or obligated to share it.
if this topic is in the wrong location, please feel free to move it
thanks for checking out the topic, I hope you can find some brush settings that appeal to you & will be useful!