Google Doodles. They seem cool but they may be distracting for some. Getting Doodles also isn’t free as they can be hundreds kB in size.
There was no option to disable Doodles as they are core part of Google Chrome, the “newtab-serviceworker.js”. Luckily just recently, based on some planned changes (Chromium tracking bug 583292), in this change “Add about:flags entries for UseGoogleLocalNtp and OneGoogleBarOnLocalNtp” they added a flag that disables the NTP (New Tab Page) service worker.
As that’s a very recent change, it’s currently available only in Google Chrome 61 (Canary) and not yet in the stable version (58). If they do not change anything, it will land in stable in about 3-4 months but they can decide to merge it into stable sooner (or also later or even never – but let’s hope they code like they mean it).
Switch this settings “Enable using the Google local NTP” to “Enabled”, restart Chrome and open a new tab – Google Doodle is gone.