The icon theme I use:

https://github.com/vinceliuice/Fluent-icon-theme

For the qt theme and the window decoration I use this:

https://github.com/Bali10050/Darkly

For the plasma theme, I use a slightly edited version of this:

https://www.pling.com/p/1595609/

For the wallpaper, I use this:

https://invent.kde.org/plasma/plasma-workspace-wallpapers/-/raw/v5.23.4/FallenLeaf/contents/images/2560x1600.jpg?ref_type=tags