New Tab by Flickr - Get a beautiful photo each time you open a new tab
Less Boring New Tab - Your browser deserves a better new tab page
Gratitude Flow - Gratitude Flow is a web extension that allows you to share and receive gratitude on your new tab with real people around the world.
Exposure New Tab - Get a beautiful photo from Exposure in every new tab
Minimo - An elegant, simplified new tab page
Google Art Project - Chrome extension from the Google Cultural Institute