Samsung's Theme Park lets you theme One UI

Samsung has answered the prayers of many users with the Theme
Park app. Available as a module for the Good Lock app suite, Theme
Park can create a theme, based on your wallpaper. It automatically
detects the main colors of your wallpaper and generates a theme.
You can choose a different color palette for different UI elements
(like the color of speech bubbles), choose a different background
color and even pick the icon, icon label and tray colors. Once
happy with the result Theme Park automatically applies the theme to
your phone. Theme Park should work on most any One UI…

Source: FS – Cell Phones
Samsung's Theme Park lets you theme One UI