Simple gnome shell extension to set current wallpaper
Shell JavaScript
Latest commit b2c55cc Jun 15, 2013 Trini Fix 3.4 errors

README

GNOME SHELL EXTENSION WALLPAPERS
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 * Extension to change wallpaper on gnome shell

Wallpaper directories
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To change where to search wallpapers edit src/extension.js and set DIRECTORIES = [ "dir1", "dir2"] with the image directories that you want

By default it searchs in /usr/share/backgrounds AND $HOME/Pictures