Smashing Magazine releases a set of wallpapers at the start of every month. For Jan 2011 as well they have a released a bunch of beautiful Wallpapers. The release features 65 free desktop wallpapers created by artists across the globe for January 2011. Both versions with a calendar and without a calendar are available. The folks @ W7Hacker have gone a step ahead and created a themepack for Windows 7 compiling all the WP from Smashing Magazine Jan 2011 release.
The complete pack of Windows 7 Theme is also available for both calendar and none-calendar wallpapers.
Download Smashing Magazine January 2011 Windows 7 Theme (calendar)
Download Smashing Magazine January 2011 Windows 7 Theme (no calendar)