Chrome 77 makes it easy to create your own Chrome browser theme in just a few clicks. Choose your favorite colors for Chrome’s browser toolbar and set a snazzy background image right from the New Tab page.
How to Enable the New Customization Tools
These features aren’t enabled by default in Chrome 77, but they’re still there: You just have to enable a few hidden flags.
As always with flags, Chrome’s flags may change or be removed at any time. We expect the flags to vanish soon when Google enables this feature by default for everyone soon.
To enable Chrome’s new customization, type chrome://flags into Chrome’s Omnibox, also known as the address bar. Type “NTP” into the search box on the Flags page.
Enable both the “Chrome Colors menu” and “NTP customization menu version 2” flags. Just click the box to the right of each and select “Enabled.”
Your changes won’t take effect until you restart Chrome. Click the “Relaunch Now” button that appears to do so. Be sure to save any work you have in Chrome’s tabs. Chrome will automatically reopen your current tabs when it restarts, but the contents of those tabs—for example, information typed into text boxes on web pages—may be lost.
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Source: How-To Geek