Believe it or not, but you can install all of the official Windows 7 Themes on Vista and XP.
One of the tools that is able to handle “.themepacks” is 7-zip:
We have added many new Windows Themes to our site. You can download them here: Windows 8 Themes
One of my favorite themes by far is the Windows 8 Transformation Theme
that will turn Windows Vista into Windows 8.
Of course Windows 8 is not out yet and all of this is ‘just for fun’.
If you are in the process of migrating to Windows 7, you might want to take a glance at Handy Backup. Handy Backup is a great backup and recovery solution for end-users and businesses alike. This handy migration tool is one of the best out there!
Just a little reminder, most themes you’ll find on this site are for Windows 7. It is not possible to use them on XP or Vista. However, you can visit this page
to get a great theme for XP/Vista.