We love Google Chrome. But quite frankly, the blue theme sucks on my black theme. If you've seen the screenshots of Google Chrome on XP vs Vista, you've probably noticed that the interface looks completely different. If you want to make your XP version use a slick black theme, you can do so with a custom hack.
Installing the Custom Theme
You'll first need to download the patched theme file from the link at the bottom. Next, open up an explorer window, and paste in the following to the address bar:
%userprofile%\Local Settings\Application Data\Google\Chrome\Application\0.2.149.27\Themes
You should see a file called default.dll, which you want to make a copy of before you do anything else.
Next you'll want to paste the default.dll contained in the theme's zip file into this directory. You should be prompted to overwrite the current file (which you should have backed up).
At this point, you can start up chrome and you'll see the new theme.
Removing the Theme
Simply delete the new default.dll file and rename the copy back to the original defualt.dll name. That's all there is to it. You should note that these themes will have to be re-patched every time a new version of Google Chrome is released, which could be quite often.