This theme is setup so that you can switch between six different wallpapers with the click of a button. My intention was to set this up so that it automatically switched your wallpaper with sun up and sun down, but I don't know enough about programming to attempt it. Anyway, it needs some setting up, in order for this to work.
To configure it, you have to open the theme file once you've extracted it, and put the FULL path to your images. If you don't put the full path the widget won't work, you'll just get a blue background.
Anyway, try it out and let me know what you think.