I So Love Gmail’s Theme!
I love the new Gmail’s Tea House Theme! At first, I didn’t know that it is changing as my local time changes so I am wondering why the background of my Gmail is sometimes with moon and stars and why there are times that the setting seems to be in afternoon. And most of all, the position and activities of the characters in the Tea House is also changing!
Then I realized that the Tea House theme has several settings that indeed follow the user’s time zone. So if I opened my Gmail in the morning, the Tea House Theme setting is in day time and the characters in the Tea House are doing some stuff that we normally do every morning. And if I opened my Gmail around 10 in the evening, the setting is night time and all the characters in the Tea House are all sleeping 
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Cool, isn’t it? Have you tried it? The Summer Ocean, Beach, Planets and Mountains Themes are likewise time-sensitive. Like me, I bet you will also like to peek what’s sitting in your background when you open your Gmail in a particular time of the day.