This is my first rice, it’s a simple one but not really “just the defaults”.
Even though it wasn’t captured in the screenshot, the mouse cursor is also changed.
The wallpaper is this one, from WallpaperCave.
I’m using the Latte Dock, but the above bar is a Plasma panel, not a Latte panel.
It’s very nice looking. You should look at Garuda tho, it’s default kde theme is very similar imo