If you choose one of the high contrast themes, you can customize the colors to be close to the classic color scheme. There is not one by default.
Choose High Contrast visual style under Personalization options and choose color options. Then you can customize it...
I honestly don't know, I tend to remove the white color wherever I can, but the moment I saw Office UI I fell in love with it... Screenshots show that Windows Explorer UI is not completely the same, but it's close enough in my opinion.
When I first saw screenshots of the new user interface, I didn't like it at all. But, few days ago I downloaded a Microsoft Office customer preview, and... wow! It looks great! If Windows Explorer is going to look like that, or similar, I will never turn my computer off. :D
While in application, move your mouse to the bottom right corner of the screen. The charmbar will open. Then click on the Setting icon- Accounts - Add an account - Choose your account - enter the account information... That's it. :)
Thank you, GMan, it solved my problem! I set it to 600 minutes, and everything works fine. NoSleepHD works while it's turned on, but I don't like to have anything starting with Windows. Marked as solved.