Should come up with a widescreen version
But those do look very cool
After a little research I found that one of the most popular Widescreen sizes is 1680px × 1050px.
If your screen is resolution size is close, you can have it stretch to fill the screen, and hopeful you will only get a little image distortion.
January 1680x1050
February 1680x1050
January 1680x1050
Might work on some from last year . . .
Here is the cover shot from 's 2010 Calender