I do like it better in white, personally. Lovely desktop overall, I'm glad you could make something useful out of KDE 
After a few years with Gnome, I'm trying out XFCE on my main machine. Still Debian 12 – I think it suits me nicely – but I've added i3 as the window manager. It's a bit weird to get used to but I'm hoping things will improve overtime.
I'm not sure where I found this wallpaper though (maybe it was here, I can't remember) but here it is:
Still need to do something to the icons and all but that will come after; I don't want to spend a lot of time on that only to find out I don't like tiling window managers 