[volandovengo]

Overall, Google at the very least has published their Material Design guidelines that are very good.

https://material.io/design/

That said, I'm annoyed that they are shutting down inbox. The UX of it was amazing.

[rchaud]

Google's own websites use Material design guidelines extremely sparingly if at all. Material Design is most commonly seen on Android apps, and that's usually because app developers aren't interested in customizing the look and feel beyond the bare minimum.