A workaround is to copy the desired wallpaper into /usr/share/backgrounds and 
rename it using one of the filenames of the default files found there:
$ sudo mv /usr/share/backgrounds/Delicate_Petals_by_lefthandgergo.jpg 
/usr/share/backgrounds/Delicate_Petals_by_lefthandgergo.bkp
$ sudo cp ~/Pictures/a-blue2.jpg 
/usr/share/backgrounds/Delicate_Petals_by_lefthandgergo.jpg
$ sudo chmod 644 /usr/share/backgrounds/Delicate_Petals_by_lefthandgergo.jpg

Now, opening System Settings -> Apperance should display your photo as
Delicate_Petals_by_lefthandgergo.jpg

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https://bugs.launchpad.net/bugs/928553

Title:
  Non-default wallpapers are not readable by Unity-Greeter

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