How can I display the quick access toolbar icons in colour in office 2016?

Currently, all my MS Office 2016 quick access toolbar icons are monochromatic, now I barely can see a image at all and are impossible to decipher. The other possibilty is use the white theme, but is too bright.

Solution

The Fluent UI (aka Ribbon UI) doesn't provide anything for customizing the QAT.

Read more about the UI and its possible customizations in the following series of articles:

Customizing the 2007 Office Fluent Ribbon for Developers (Part 1 of 3)
Customizing the 2007 Office Fluent Ribbon for Developers (Part 2 of 3)
Customizing the 2007 Office Fluent Ribbon for Developers (Part 3 of 3)

The Backstage UI is described in depth in the following articles:

Introduction to the Office 2010 Backstage View for Developers
Customizing the Office 2010 Backstage View for Developers

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