By following this tutorial, you'll get the same Windows 7 "Window Color and Appearance" tab  in Vista.

Before applying this tutorial:

After applying this tutorial:

As you can see the difference in the glassy images used for different colors.

So here is the tutorial:

1. First download following ZIP file and extract it:

Download Windows 7 "Color and Appearance" Tab for Vista

2. Now go to "%windir%\System32" folder and look for a file "themecpl.dll".

3. Once you find the file, take its ownership using following tutorial:

Add Take Ownership Option in File / Folder Context Menu in Windows Vista and 7

4. Now rename the file to some other name like "themecpl_backup.dll".

5. Copy the "themecpl.dll" file from downloaded ZIP file to "System32" folder.

6. Now go to "%windir%\System32\en-US" folder and look for a file "themecpl.dll.mui".

7. Once you find the file, take its ownership.

8. Now rename the file to some other name like "themecpl_backup.dll.mui".

9. Copy the "themecpl.dll.mui" file from downloaded ZIP file to "System32\en-US" folder.

10. At last run the "install.reg" file present in downloaded ZIP file.

11. That's it. Now restart your system and get ready to see the new Windows 7 "Color and Appearance" tab in Vista.

Thanks to pierdelp for creating this file...