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Screenshot of a Reddit post about Seelen UI, a desktop environment with a top bar and a bottom dock. The top bar has an app indicator on the left, the date and time in the middle, and system indicators on the right. The dock contains the Start button, pinned apps, and a small multimedia player.
For that one in particular its the jaggy edge and brightness. I prefer solid black, but haenau or hunyago or nice (very slowly changing shapes with dark colors).
I suppose I too rarely see the background/wallpaper so I guess it wouldnt matter. Particularly since I use a desktop that doesnt allow files or folders to be placed on the desktop.