Thanks to James
How do I install my new theme?
To install these themes, download your desired theme then uncompressed it and copy the default.dll file(found in zip) and replace the once found in:
Windows XP: C:\Documents and Settings\User\Local Settings\Application Data\Google\Chrome\Application.2.149.27\Themes\
Windows Vista: C:\Users\UserName\AppData\Local\Google\Chrome\Application\0.2.149.27\Themes\
Note: Don’t forget to make backup of default theme file before replacing with new one.