Made these brush shapes in Inkscape and turned them into Gimp brush files. There are 28 brushes in all. Have fun!
(Note: The Gimp logo icon is from the Tango Icon set - [link])
(Another Note: The license below for the brush files themselves says you need to attribute me for their usage. You don't need to. Have fun - just make sure you share! )
Hi ryder, I don't use any Adobe software, only open source software so I can't convert them for you. Sorry! But if anybody you know is able to convert them, they are of course free to do so as long as they release them under a CC-BY-SA license!
Thanks!