
Using the Rectangle or Free-Form Select Tool, (
) Trace along one of the shapes. Copy the image using the rectangle tool.
Open the image onto a blank document in Photoshop. (File » New, Edit » Paste)
Now go to Edit » Define Brush. Name it whatever you like & say OK. You're now done =)

Now click on the brush Tool (
) and go to the top toolbar where it displays the brush. Click on the drop-down menu & choose the brush you like. (The custom brushes you saved to Photoshop should be near the end)

Now just put the brushes on your image!! That easy! :)
Your Finished Product: