so 9 days in the month is a little late for this but here is a March 2010 desktop wallpaper calendar. very simple for now.
(PC: right click > save as...
MAC: control+click > save image as...)
its 1024x768 to fit most screens.
i'll try to do this for every month and also start having more options in sizes and more wallpapers to choose from per month as well.