This is a very easy to follow and simple tutorial for those wondering how to make their own brush file.

Step One

Firstly, open up a new file in Photoshop -> File -> New (or CTRL+N)

The Backgound must be white!

Make the image large enough to fit your image on.

Step Two

Put the image you would like to convert to a brush on your white background.

In this tutorial, I am going to convert a circle into a brush.

Step Three
Keep in mind that everything that is in WHITE will NOT be picked up by the brush. Everything else will.

I have made a yellow image therefore the brush will be slightly faint. If the image is black then the brush will have a stronger dark colour to it.

Now we will define our brush. Do this by going to FILE -> DEFINE BRUSH PRESET

Step Four
Now we need to name our brush!

Name the brush, I have named mine Circle and then hit OK!

Now, all you need to do is click the (brush) icon, scroll to the bottom and you have your own brush!