I'm just going to quote my tutorial from my site...if that's okay. :/
Click on the brush on the tool window. See at the top left, where you see a soft, round dot? Click on the drop down arrow beside it, and you will see a bunch of other 'brushes' that you could use. Here's is an example of a picture without and a picture with brushes.
without:
http://i6.tinypic.com/11v156q.jpgwith:
http://i5.tinypic.com/11v1994.jpg(brushes from themagic-box.net)
So, basically, it's the same thing you have right now (unless you've downloaded brushes already) except it's a lot fancier. When you download a brush, it usually comes in a zip file. Just unzip the file, and inside, there should be an .abr file. In Photoshop, when you click the drop down arrow to view all your brushes, click on the arrow on the top right corner of that window and click "Load Brushes".
Clicky HereBe careful when you download brushes from the internet, because some of them may not be for the version/program you have. Some of them might be for Paint Shop Pro, or a higher version than the version you have.
