How to change the theme of Office 2013

I've improved things a tiny bit by calibrating my displays. Right-click on your monitor (not in an app), go to Personalize, Display, then Calibrate Color. It might help you.

Obviously not that closely as it's not 2015 and still not fixed.

I have just purchased 2013 and almost wish I hadn't as the colour schemes are awful.

Yes and to add insult to injury, I have just upgraded to Windows 10 and would you believe it the same issue exists with all of the new windows. White on White on White.

ARRRRRRRG

Thank you for the feedback on Office’s new look. We are actively collecting, sorting and reading through feedback on Office 2013’s design and User Experience. As the audience for Office 2013 grows, we are being mindful of patterns and pain points that emerge from user feedback. While we do not have any additional Themes planned at this time, it is an issue we are watching very closely.

32 months later, and we still have only White, Light Gray (or as I call it, "Slightly-Less-White"), and Dark Gray (or "If-You-Wear-Sunglasses-While-Using-Office-It-Sort-Of-Looks-Dark-Gray").

Why don't we all pool the money from our Office 2013 refunds together and buy 1,000 of those spotlights they put at car dealership sales, and point them at every window and every exit of MS' corporate office. When they tell us to turn them off, we'll offer to let them change the theme to Light Gray by turning off 30 of the lights, or to Dark Gray by turning off 70 of them.

Note: This was an approximate calculation of the brightness difference, arrived at by: using Microsoft Paint on screenshots of a maximized Outlook 2013 window on my 1366x768 display, using the color picker on the part of the UI that appears to be the median shade among those pixels that change colors - the background of the title bar, unselected folders, and the To-Do Bar; checking the luminosity of that shade against 240, the luminosity of these elements in the White theme; and multiplying the difference in those luminosities by that percentage of pixels in the window that do not comprise the message list and Reading Pane. This could be too generous, since icons and the background of Quick Steps don't change at all, or it could be too stingy, since the status bar and some other elements darken more than those areas, but I think it's still close enough for the analogy.