Recently Google introduce a new look-n-feel to their home page (+ SERP pages) with a certain Blue and Red color combination. And it seems that (makes sense) they'll be applying this "look-n-feel" to their other services GUIs as well. Although it won't happen overnight but according to the Gmail team, now you can "preview" some of these new features in your Gmail account quite easily.
|Not the most user-friendliest colors for my taste :/...|
In their own words this is an attempt to make...
"...one of the reasons we’re embarking on a series of interface updates to help strip out unnecessary clutter and make Gmail as beautiful as it is powerful..."Although I do agree that after switching to the Gmail preview feature the account looks more simpler but I'm not entirely sure about the user-friendlyness of the whole GUI as a whole because the white background with the Red color aren't that comforting for the eyes and I personally prefer the old Blue and Green combination.