I generated 10 Gaussian blurred rings at around 1000 pixels that I though would be good for brushes! These would probably make decent stroke style brushes as well as stamp style since they are pretty high resolution. Download contains a .abr file that contains all ten brushes, which will work with Adobe Photoshop CS5 or Gimp 2.4 and later.
Download Ring Shapes Photoshop Brushes Set
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