I am looking for new brushes with gimp or better blender tools. Is there a link to show you how to install the scripts if you find one that is interesting?
Brushes, patterns, gradients, palettes, all work in the same way, as each has its own folder recognized within GIMP's folder preferences (Edit - Preferences - Folders in the GIMP menu) The single user (.gimp-2.6) folders is recommended (see the tutorial for more information).
Other "How To" info:
Also, there is GIMP Paint Studio, that comes along with different brushes and pen options, found here (in Spanish - use Google translate):