Google Chrome a faster,easier and secure browser now introduces themes designed by top artists. To get those themes you need to update the Chrome version, to do that- go to settings icon displayed at right corner of the address bar and select " About Google Chrome ".Click update and visit Chrome themes , choose your theme and click on 'Apply theme'.
Note: If you are failed to update the server - after clicking 'About Google Chrome' then visit the following link to rectify the error. http://www.google.com/support/chrome/bin/answer.py?hl=en&answer=111996