Feature Idea: Background Persistence
Throwing out this idea I had to add some extra goodies to the wallpaper setting function of feh for feedback. The idea behind this addition would be to add a option --bg-preserve that could keep the contents of the existing wallpaper and overlay the contents of the new image from --bg-center (probably specified with a geometery) over the existing wallpaper.
This would also help with multi-monitor setups for setting different wallpapers across the different physical displays. For example
This command is used to set the centered background on the first phyiscal screen.
feh --bg-center ~/.backgrounds/001.png --xinerama-index 0
This line is used to set the centered background at a custom position relative to the origin on the secondary phyiscal display keeping the previous background on the first physical monitor. Without --bg-preserve it would behave as if the first command was never run.
feh --bg-center ~/.backgrounds/002.png -g +150+200 --xinerama-index 1 --bg-preserve