This script creates nice shapes in Gimp. The model is a layer/path it will be duplicated a few times and these copys will be moved and/or rotated.
The coolest effects can made with a spline (from a path). In the new version you can choose if you take a path or a layer. The interest here is, that you don't lose on quality.
So, here's a little guide:
1. Create a path and make it visible.
2. Start the scirpt (Filters/Shapes) and make your settings.
3. Go to paths dialog, right click -> Merge Visible Paths
4. Stroke the Path with default options