Among free software graphics application, Krita is unique in that its painting system is plugin-based: all Krita brush engines are plugins. Starting with the sumi-e hairy brush engine I worked on during the 2008 Google Summer of Code, I continued writing over half a dozen experimental, funny and useful brush engine for my Master’s Thesis at the VŠBTechnical University of Ostrava. This presentation will start with a live demonstration of these brush engines. The second part will be more technical: I will give an introduction into the art of writing brush engine plugins for Krita. It’s easy and fun, not difficult at all!