You will need:
- Photoshop (of course)
Step 1: Five Simple Steps
First, you must create a blank layer in the layers palette. You can do this by either clicking on the new layer icon, or hitting cmd + shift + N, (ctrl + shift + N for PC).
With the brush tool, create how the brush will look. In this particular example, I did a simple spiral, but you can really turn anything into a brush, even a signature or a full drawing!
Now we need to make the brush into a selection. This can be done by cmd clicking, (ctrl clicking on a PC), on the brush layer icon. Once you have done this, you will see "marching ants" showing you your selection.
With the selection active, go to the Edit menu in your toolbar and choose edit > define brush preset. Name and save your new brush. Easy right?