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"The -b (background) option tells sudo to run the given command in the background." -- after it asks you for the password in the foreground.
You'll need "feh" to set the background from the commandline. Install with "apt-get install feh"
Thanks to the Redditors on this thread: http://www.reddit.com/r/linux/comments/bira4/is_there_a_linux_version_of_this_preferably_a/