There is possible to read a post with draft plan to redesign the brushes:
https://medium.com/graphic-arts-free-software/gimp-2-9-set-brushes-810baff9431b
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some years ago, in 2013... I have begun the process of redesign of all
brushes of GIMP 2.8+. The idea was organize a set to the next GIMP release.
This work was suggested by Guillermo Espertino... I think, that the
Prokoudine knew the project through the my g+ account.
I had, in this period, the