Since openCanvas6 has been released, I've been tinkering with it's brush engine, and so far this is the result. If you have no idea of how to customize your brushes and are getting tired of OC's defaults, check those out!
Just click up there to download and follow the instructions included in the Readme. Easy stuff.
Dunno what is openCanvas to begin with? Check it: www.portalgraphics.net/en/oc/
EDIT: Added more brushes, along with a swatch set. The swatch also comes with versions for Photoshop and Painter, for those interested.