New site theming options for SharePoint sites in Office 365

https://techcommunity.microsoft.com/t5/SharePoint-Blog/New-site-theming-options-for-SharePoint-sites-in-Office-365/ba-p/94001

Sometimes there’s nothing like a fresh coat of paint to make a room or a house look new, familiar and engaging! Well, get your paint brushes ready. The new site theming experience, previewed last may during the SharePoint Virtual Summit (showcased here), will begin rolling out to First Release customers on August 21st, 2017. This new capability provides site owners with six default themes that can be applied to all pages of the site – both within team sites and communication sites.

To get started, just click the upper-right site gear icon, and then select Change the look. You then can quickly click on each item and see the change in real-time. In no-time you’ll have the site looking spiffy and new.