Step 1) Make a a New document with 2000x2000 Pixels as the picture below use all the same info
Step 2) Make a New Layer and Do the following:
Choose Brush 300px
On the layer you just made do like in the picture or differently with the colors you want ( i did mine randomly for an Example)
Now for the Brushes:
The Trick is Both the forground and background colors now must be white.
Take the Brushes and Click on where You want it to show up.
here what i ended up with.