View source for GIMP Custom brushes

Enable Windows -> Doackable Dialogues -> Symmetry Painting , Horz + Vert + Center

* Create a new image
* Set it to Mode Grayscale
* Paint your brush in black
* If you go just by using the clipboard then when you select the brush select the clipboard mask
* Otherwise if you save it , it will work directly.
* To save it you need to put it in the brush folder. In my PC is here: F:\My Programs\Gfx\GIMP 2\share\gimp\2.0\brushes\