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I have found these instructions which do what I want, unfortunately it requires expensive Photoshop software: http://sitemason.vanderbilt.edu/files/eLdE8E/Photoshop%20Passport%20Template%20Instructions.pdf
Basically, I need to plaster the same picture 6 times on an image, so that after sending it to Walgreens for printing I can take the 4x6 and cut it up into six 2x2 pictures.
Thanks