Nitrogen is a light and simple GUI for handling and changing the wallpaper/background.
Mostly Feh is used with fluxbox.
Nitrogen is available as default in AB.
nitrogen --restore &
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Using Nitrogen to handle wallpaper/backgrounds with Fluxbox is what I do.
I have found Feh to be too cumbersome and not as easily configured as Nitrogen is.
And Nitrogen has a nice and simple GUI.