I don't mind you asking, but alas I'm not sure I can answer...
That is, I used the image, not the brush, and copied it in as a layer.
But I can't remember who made the brush anymore, it's so long ago. It might have been quebelly, but I'm not sure. She should be credited in the brush credits (http://www.livejournal.com/users/wizzicons/26101.html)though...

Thanks for your interest and for the nice comments :)