Hi Matthias,I dont sure if it could be useful for you, but you may be try in alternative with gnome-tweak-tool,bye,EmilioRascazzo Emilio2015-08-06 10:17 GMT+02:00 Andrea Vettorello <andrea.vettorello@gmail.com>:Hi,I don't remember to have seen such an option, I suppose the only way at the moment is to create a wallpaper with a colored border yourself, maybe using http://www.imagemagick.org/script/command-line-options.php#borderProbably not what you were looking for...--Andrea