A set of patterns designed by pehaa.com some spiral stems and stroked them with one of the built-in calligraphic brush As a result: two sets of patterns for Photoshop and Illustrator.

Put the .pat file you’ve downloaded into the folder /Users/{username}/Library/Application Support/Adobe/Adobe Photoshop CS…/Presets/Patterns (on mac OS X) or C:\Program Files\Adobe\Photoshop\Presets\ (on Windows) (the dots … are there since I don’t know your PS version).
Download: http://pehaa.com/2009/02/free-photoshop-and-illustrator-patterns/