Ah, sweet!

Do you know if this supports any DE (or no DE)? Or is it strictly for KDE Plasma?

Plasma wallpaper plugins are, well, for Plasma.

When it comes to wallpapers, you could do a similar trick on X11 DEs by putting it onto the root window (with a tool like xwinwrap) and on Wayland DEs that support layer-shell (with a tool like windowtolayer). I'm not aware of screen lockers that do something like that, but you could always write your own one.

	▲	imiric 6 days ago \| parent [-]
		Right, but I hoped it would work as a standalone Qt app. Yeah, I've used xwinwrap before, but am lost on Wayland. I'll look into windowtolayer, thanks. I'd rather not have to write this myself...