GimpResources Thumbnailer
http://kde-apps.org/content/show.php/GimpResourcesThumbnailer?content=107128

   GimpResourcesThumbnailer is a thumbnail service for KDE. It can be used
   in any KDE application that supports the thumbnail kioslave, like dolphin
   or digiKam. You can preview all of your Gimp resources like brushes and
   patterns, to easily manage them into folders, without the need to open
   Gimp.
   
   The following resource types are supported:
   * Gimp-Brushes (.gbr, .ghi, .vbr)
   * Gimp-Patterns (.pat)
   * Gimp-Palettes (.gpl)
   * Gimp-Gradients (.ggr)
   * Adobe Photoshop Brushes (.abr (v6))