If you're a fan of the embedded calendars you see in our featured desktops but aren't into installing a lot of extra customisation apps, Big Huge Labs has a tool that embeds a monthly calendar in any wallpaper image.
This wallpaper tool is seriously easy to use and greatly customisable, which is exactly what those with an eye for desktops need. You can upload photos from your computer, pick them out of your Flickr or Photobucket accounts, or direct the chooser to an online image.
You choose the final resolution, the calendar month you need embedded (so you could, in theory, stack up these wallpapers into infinity), then choose the position, text and overlay colours, and hit the Create button to see the final product.
Easy to use, nice results, and we definitely want to see your best results linked in the comments.