http://www.graphicxtras.com/products/psbrush.htm
PDF files are vector designs and can be used with any size of document, they are also a great source for Photoshop brushes. Shows how to import / open /place the PDF files and then define the brush. The tutorial is in Photoshop CS5 but the same approach can be used with CC CS6 CS4 CS3 CS2 etc PC and MAC OS X.
All the designs in the video are by me / educational video
