Haha, that's so weird - someone else just asked me that same question. Anyway, I already had the swirly brushes downloaded on my computer from when I was using the Photoshop trial. But then that ran out, obviously, and I found GIMP instead. Then I found this tutorial ---> [link] <--- showing you how to use new brushes in GIMP. Hopefully it'll help you as much as it helped me!