As part of its Hidden Treasures of Creativity project, Adobe transformed the centuries-old paintbrushes used by Edvard Munch into a set of free Photoshop brushes and is offering them to Creative Cloud users completely free: download your brushes here.
To help you make the best use of these brushes and channel your inner master painter, Adobe has also put together a series of video tutorials. The first tutorial (watch here) explains how to get started with digital painting in Photoshop.