The most visited sites are displayed as 6, 8, or 10 icons (these are shortcuts using sites' favicons to be exact), depending on your screen resolution or browser width. Part 1: Remove or restore a 'most visited' site shortcut (icon) in Google Chrome's New Tab page We have updated this article accordingly and split it in two parts: part 1 for the new site icons and part 2 for site tiles, the now 'old' look that can still be enabled via flags.
If you're seeing sites' icons rather than tiles when you open a new tab in Chrome for Windows, Mac, Linux, Chrome OS, this is due to Chrome's recent updates to the New Tab page's look and feel. The Google Chrome 'New Tab' page features the most visited sites you accessed since the last time you cleared your browsing history.