All you need to do is to download your own Google Chrome themes. You can google for it or you can visit the sites below.
After you have downloaded your Google Chrome themes. The next step is to extract the “default.dll” file
For Windows XP users
Extract it to : C:\Documents and Settings\User\Local Settings\Application Data\Google\Chrome\Application.2.149.27\Themes\
For Windows Vista users
Extract it to : C:\Users\UserName\AppData\Local\Google\Chrome\Application\0.2.149.27\Themes\
Restart your Google Chrome. You should see your new theme now.
If you find the steps above too complicated. Read on.
Use XChrome, XChrome is a theme manager for Googles Chrome browser, it allows users to install a skin in seconds without having to move default.dll around and it allows you to view the author and various other details before installing.
XChrome also allows users who do not have XChrome install to install themes by double clicking the themes .exe file, they are prompted to install the theme, they agree the theme is copied to Chromes Default.dll
Screenshot of XChrome Beta Release 5
Install and run instructions:
1. Download the .zip file and extract it’s contents
2. Make sure your Google Chrome browser is close and run Xchrome.exe
3. Select the theme from th left menu of available themes and click “Install Theme”
4. To add new themes simply run the Theme packer and specify the path to default.dll for the theme, or use the already packed executable ones.
Notes: XChrome is still in Beta, so bugs may appear. Also XChrome uses certain processes like registry editing, file copying and others which may cause Antivirus think it’s a virus, so just disregard it.