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This command clones an image three times and creates a 'tile' image that can be used for a repeating pattern wallpaper. Add 'rm $f $of $off' to the end for cleanup (command was too long to submit with it).
See this link for an example: http://meathive.deviantart.com/art/Easy-Photography-Hack-314846774
There are 6 alternatives - vote for the best!
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