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Most of the “looks” come from the compositor (picom) and the bar.
Or if you’re running Qtile under Wayland then Qtile is the compositor too. My dotfiles and a screenshot are here to show what’s possible.
Basically it’s a piece of software that renders visual effects. It can also eliminate Frame tearing and minor janky visuals that you would see in a Window manager session.
Picom is the one people usually use in Xorg.
Picom allows you to specify window border corner radius and such which can help you fine tune your Rice’s looks.