I use Seashore as my main image editor on Mac OS. I’m not a graphics designer so I don’t need an uber-powerful, all singing, all dancing graphics editor.
While Seahorse fits my needs, one thing it does lack is a comprehensive set of brushes. However, because it is based around GIMP, you can use brushes created for GIMP.
To add brushes to Seashore you need to do the following:
- Locate Seashore in your Applications Folder,
- Cmd-Click on the Seashore.app and select “Show Package Contents”,
- Browse to “Contents -> Resources -> brushes”,
- Drag and drop your GIMP brush set into this folder.
There’s plenty of free GIMP brushes available on the net, but deviantART is a good place to start.