Open a new tab, they will be displayed at the top.
Ctrl + Shift + N
If you do not want to see apps but want to see most visited sites just click on "Most Visited" in the new tab.
Yes you can change it back from Google chrome to Google classic. just enter this URL "http://www.Google.com/support/chrome/bin/answer.py?hl=en&answer=95319" and follow the instructions.
It is located in the upper left side of the screen. It is the arrow pointing to the left. Clicking it will take you to the previous page.