Paris
Since the mid 90's, the livery of the bus and train of the RATP were white and jade green.
Now the newer buses have a livery that includes grey .
Grey is the color of the STIF, the transport organisation authority in Paris region (Île-de-France).
Jade green is the color of the RATP, the operating company.
Every new transport rolling stocks in Paris Region has some grey in its livery, infact the RATP has been the latest company to have the color of the STIF in its vehicles.