Find the Brushes you want
You can add brushes to Photoshop from lots of different sources. Most of them are silly and useless, but if you do find some you like, get the .abf file for the brush. It's icon looks like this:
To use it, save the attachment above to your local hard drive, open Photoshop, open the Brushes window and from the popup menu in the upper right, choose Import Brushes:
Navigate to where you put the .abr file and select it, then click OK. You will find both the imported brushes at the bottom of the list of Brushes in the Brush panel, preset to 5 pixels.
