I will provide you with GIMP brushes and once i learn how to make patterns, prvide patterns too
Always click download to download the zip files.
the brushes goes into:

...\GIMP-2.0\share\gimp\2.0\brushes

Please give credit where it is due.

If you had use these in your deviation, please show me by linking them in a comment here, or this journal, note or the bruch deviation.

And if you have anything in particular, i can do a request also.