Well I created them so I own the copyright so you don't have to worry about using them (as long as you credit them). Send me a link in the chat if you make a post.
I will make more if people find them useful.
I first started experimenting with these brushes a while back so I could create textures for photographs rather than abstract pieces in their own right - I think they can work both ways though.
Ok I will be happy to use it.