Transform Windows XP to Windows 7 Look With Nifty Tool
 

Seven Transformation Pack will replace many of the resources in Windows XP/Windows Server 2003. It can change such things as:

* Boot screen
* Welcome Screen / Logon Screen
* New msstyles files (visual styles)
* New desktop and file icons
* New toolbar icons
* Progress Dialogs
* Sounds scheme
* System Tray icons
* New Wallpapers
* Some Windows 7's popular features
* And much more

http://www.windowsxlive.net/seven-transformation-pack