Samir Behara shows how to differentiate environments with custom tab colors:
The initial January release insiders build focuses on bug fixes and minor feature improvements. One thing which caught my attention was the ‘SQL Editor Tab Color‘ to differentiate between query tabs inside the IDE.
Using Custom Color to differentiate between environments is one of my favorite feature inside SQL Server Management Studio. The color is displayed in the SSMS status bar, at the bottom. Hence when you connect with a particular environment, it uses the same assigned color. This presents a visual indication of the environment in which you are running your scripts. Lot of 3rd Party tools from RedGate and ApexSQL also has their own versions of setting different colors while connecting to different environments.
Using environment-specific color schemes can be a life-saver.