With not a moment to spare, here's my April 2010 desktop wallpaper / calendar image, again in two image sizes, one wider than the other. This is a detail view of a waterfall in Copper Falls State Park near Mellen, Wisconsin.
To set an image as your desktop wallpaper, just right-click (PC) / control-click (Mac) on one of the links below and save the image to your desktop or some other location where you'll be able to find it again. Then right-click (PC) / control-click (Mac) on the image and select the option to make it your Desktop Background / Picture.
Even easier, some browsers will let you set it as your Desktop Background / Picture directly from their context menu when you right-click (PC) / control-click (Mac).
As always, please leave your comments below to let me know what you think!