Windows 7 Skins for XP and Vista:
Free download the official Windows 7 Wallpaper Pack from this here.The skin pack contains 50 different Windows 7 wallpapers to decorate your Windows XP or Vista desktops.
All the 50 skins are high resolution (1920×1200) wallpapers suitable for any screen size and are available in varied themes, designs and colors. You are sure to find a suitable Windows 7 skin for your XP or Vista desktop. Enjoy the Windows 7 Theme on your Windows XP or Vista Desktops.
If you don’t have windows 7, you could try the beta before deciding to buy the full software. Find the Windows 7 beta direct download links to download the beta from the official Microsoft server. You may use these Windows 7 Beta activation Keys to activate and use it for six months.
The above beta downloads are available from the official website, through January 24, 2009. However, if you do not have the time to download and try Windows 7 Beta, you can use the above themes to get the looks of Windows 7 in windows XP or Vista.