Android Auto 13.4 Update Adds Colorful Flare with Material You Accents

Google appears to be adding Material You accent colors to Android Auto with the latest updates. Some users running version 13.4 have noticed colorful accents in various UI elements in settings and notifications, but not in apps.

The changes appear inconsistent at times - sometimes changing only if you force stop the Android Auto app and reconnect, or not changing at all. Presumably Google will make further updates over time.