1) Customize New Tab with Predefined Sites by SpeedDial
Normally, Chrome shows you most visited sites on opening a new tab. You can change this behavior, in fact make is better and attractive by SpeedDial. With this extension, you can predefine your tab sites instead of most visited one when opening new tab. You can also change tab background image, number of blocks and use site logos. This is the best extension to beautify chrome.
2) Keep Track of Time with Modest Digital Clock
If you like to follow time, then this clock extension will help you with your punctuality. It is simple and minimalist but yet very useful. It de-clutters the new tab with the most precious thing.