A similar one changes my LED-filled floor lamp (running WLED) to a pattern that matches the current weather conditions. Falling rain, lightning, heat "rising". Sort of an ambient notification system.

Another warns my wife if her commute time home is expected to be longer than usual, so she can opt to get a bit more work done if it means a quicker drive with a similar arrival time.

My favorite is the laundry notification. Current sensing outlets let us know when the washer or dryer is in use, and door sensors track if the lid to the washer or dryer is open/closed. So if someone starts laundry, the HomePods play a chime and announcement that "the washing machine is done!" If the door isn't opened in 15 minutes, it chimes again. Another 15 minutes, and a notification is sent to me and my wife. :D