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Ricing refers to, in this case, modifying the user interface of your desktop for purely aesthetic reasons. This involves choosing which programs will make up your environment, such as the window manager, bar(s), the colors and fonts, the wallpaper, and all that kinda stuff. The term originates from the practice of over-modifying Japanese motorcycles.
Here are some of my rices. As you can tell, I've stuck to trusty i3-gaps my entire ricelife, and have switched between i3bar and xfce4-panel for my bar. The arch days were more comfy.