It fakes a blur effect under the wingbar panel on elementary OS by editing your wallpaper.
> wingbar-blur --help
Usage:
wingbar-blur [OPTIONS]
Application Options:
--path= Path to the wallpaper.
-t, --theme= Choose theme: none, light, dark. (default: none)
-o, --opacity= Theme opacity (default: 0.15)
-b, --blur= Choose blur intensity (default: 20)
-s, --size= Choose size (default: 30)
Help Options:
-h, --help Show this help message
wingbar-blur --path ~/Pictures/cool_wallpaper.png --theme light --blur 50 --size 10