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Themes
You have the ability to choose a color theme that you would like to use to customize your Office 365's look. Simply click on the down arrow next to Themes and choose from the available themes.
New themes are added all the time. Some even have animation! Remember to click the Save button once you have chosen your theme or your theme will return to the previous one as soon as you close Settings or navigate away from the page:
If your organization has created a theme for your organization and has chosen to make it an overriding theme, you will not be able to choose your own.
Click the up arrow in the bottom-right corner of the Theme page's Settings when you wish to collapse it.