Oh and if ever you realize that you want them back (default brushes of gimp) here is the place where you can find it:
Default GIMP Brushes by ~Project-GimpBC on deviantART
and if you want new cool ones especially designed for gimp, here the resources links to my officials servers
http://project-gimpbc.deviantart.com/gallery/
&
http://redheadstock.deviantart.com/gallery/