In this GIMP tutorial I tell you what brushes can be used in GIMP. How you can download both GIMP brushes and photoshop brushes and how you can install brushes in GIMP.
I’ll also be talking about how to use them. The paintbrush tool and the airbrush tool in GIMP usually give the nicest results.
lightning brushes used to demonstrate made by obsidian dawn
Where to download brushes