Android 13's Wallpapers and Themes to Get Spicier - Droid Life

In that order, they are being described as a theme similar to the current wallpaper theming you know from Android 12 to one with a change in accents to one that might get wilder in colors to a more muted, even desaturated look.

For Android 13, we don’t know if Google is changing that settings page or not, where you pick a theme, but it should look similar.