How to change the theme of Office 2013

I cant even change it to the blue theme. It is not showing me the personalise option in Preferences>general?????

Welldone. We are about to enter in 2016 and there is no action... Great!!!

As another over 40 (way over) user with experience in designing user interfaces, I strongly agree with Alex and Phil. This minimalist approach might have been more useful a couple of decades back when we were using small CRT monitors. But with a flat screen monitor bigger than my family TV when I first got married (60's), I have plenty of screen real estate now and I like my options available with as few clicks as possible. That's why I'm still using IE instead of Edge.

There are many things I like about both Windows 10 and Office 365, but were some things "fixed" that weren't broken. As someone who spends hours a day in Office, I could go on and on, but this isn't the venue for that. I want to underscore what Alex (and many others whose posts I've read) said: I think Microsoft  (aka Micro$oft ), ignores a LOT of user input that does not align with where they already want to go. I have been sending them comments for years about some specific (still unfixed) things and these sites are replete with complaints about problems that have persisted since Windows 10 Beta.

Maybe a saying I head long ago applies: "Once a bureaucracy reaches a certain size it no longer needs any contact with the outside world."

As an information designer, I'm totally with you, Phil. A recent Micro$oft update precipitated a Blue Screen of Death catastrophe & a "helpful" techie decided it was time to install Windows 10 on my PC, as everything else had to be re-installed anyway. Office 2013 (& I hear 2016, as well) & Win 10 have gone drastically backward as far as usability goes.

If I ran the Office & Windows GUI development teams, I'd fire them all, and anyone that had anything at all to do with approving or promoting this "clean" look. Not only that, but as I have repeatedly mentioned in this thread, I cannot understand the trend towards increasing the numbers of clicks to execute common functions. Instead of clicking, for instance, on a "blank page" icon in Word 2013 to get a new file, I now have to click File >New > Blank page. WHY?! So stupid.

If I want a new doc from one of my own templates, still another step. Sigh... 

DEAR MICROSOFT: There are more of us in the US over 40--ie, people who probably need reading glasses--than any other demographic. What is wrong with you?! 

Oh, well. I don't know why I bother. I just can't believe they pay NO ATTENTION WHATSOEVER to this thread or any other on the same theme. But they obviously do not.