Stone Castle is a nice screensaver which shows an old castle made of stone, in the middle of a lake. The image was taken during the evening and the sky is overcast so the the only light available is the one coming from the castle. The castle is reflected in the lake, which has slight movement and there are water sounds. These three things make the scene much more realistic and pleasant. Unfortunately, the screensaver doesn't include sounds or music, and neither can you add your own.
In the settings menu you will find a small viewer which will allow you to view the screeensaver's image while you configure the settings. Sadly, this screensaver doesn't include many customization options. You will only be able to customize the animation speed of the water and the image size. Sounds can be muted, and you can also add a transparent analog clock in any of the screen corners.
In short, if you are looking for a beautiful landscape to decorate your screen with, Stone Castle may be an excellent choice.