In 4.12 xfdesktop will allow you to select the folder to pull images from rather than having to add them to lists. You can see the basic concept from the on-line documentation: http://docs.xfce.org/xfce/xfdesktop/4.11/usage
Doing multiple directories would be more complicated from the new UI layout, but you can always make a directory with symlinks to the images from other folders that you want.
In 4.12 xfdesktop will allow you to select the folder to pull images from rather than having to add them to lists. You can see the basic concept from the on-line documentation: http:// docs.xfce. org/xfce/ xfdesktop/ 4.11/usage
Doing multiple directories would be more complicated from the new UI layout, but you can always make a directory with symlinks to the images from other folders that you want.
Will that be sufficient for your needs?