Each month, Smashing Magazine puts together a set of stunning desktop wallpapers for the month with calendars on it. This time, for Jan 2010, they featured 35 free stunning desktop wallpapers, created by designers all over the world.
Tim Heuer, a Program manager on the Silverlight team, likes them so much that he figured why not make a Windows 7 theme out of them.
So here you go, Smashing Magazine January 2010 Desktop Wallpaper Windows 7 Theme (direct download link).
Note that, most of the wallpapers are made for widescreen. So you would need to set the picture position to Fit in order to show the full calendar in some of the wallpapers.
Enjoy, and Happy New Year!!