This is a simple script that duplicates a layer n number of times with rotation. Optionally add white background (and convert image to Grayscale) to create either RGB or grayscale brush.
Grab it in the downloads
Known Bugs:
The script misfires sometimes – the source does not get copied to the duplicated layers (it remains as floating selection). Not sure if this is my fault or a bug in Gimp.
GIMP Plugin - Vector Path 2