This tutorial is for Paint Shop Pro, but it has the same tools as Photoshop, so this might work for you with just a little change in nomenclature:
http://www.myjanee.com/tuts/brush7/stitch/stitch.htm 
Oops, it IS for Photoshop!
Last edited by thepolyparrot; 11-07-2011 at 10:30 AM.