I had a little go of the open source painting software called Krita. I really like it so far just after a few days and it has some really interesting brushes. The interface was a bit odd to me at first but I now prefer it to Corel Painter’s interface- it just seems friendlier somehow. It also has a wrap-around mode which is very useful for creating seamless patterns very easily.
I did this sketch of a bunny just messing about with some brushes:
I made a pattern in Krita and used it as a repeating background for this picture I did of a bison. The Bison was painted in Corel Painter 12 with my own brush set.