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Hello, I'm really new to KDE and unfortunately Wallpaper Engine is only for Windows and I really miss it. It would be really cool to have a built-in "Wallpaper Engine KDE/Plasma Edition". You also should be able to place things like audio visualizer. I actually found Komorebi but it's really bad (No real desktop icons for example and the way to add new wallpapers isn't efficient) and is a CPU eater.

So I hope we can see something in the future.

Mmm... don't know what that wallpaper engine thingy is
guessing from what you say... you are wanting to add wallpapers to the desktop
well you have options
right-click on the desktop and select configure desktop
the wallpaper type has options and/or you can download plugins...
as for the audio visualizer... there are media players--like Audacious--that can do that for you