Here's a nice screensaver that shows a bay in China. The scene shows what looks like a lake with a small pier and a pagoda, from where you can contemplate the city that can be seen behind it. The image has a yellow tint to it, brought in by what appears to be the usual morning smog seen in any Chinese megalopolis; the water is animated, which creates a more realistic effect. The water sounds also contribute to creating a relaxing atmosphere. Unfortunately, the screensaver doesn't include music and neither can you add your own.
Sadly, the screensavers offers only a few customization options. You will be able to adjust the animation speed of the water and select the image size. If you find the sounds disturbing, which I doubt, you can easily mute them by unchecking the corresponding box. If you want, you can also add a transparent analog clock in one of the screen corners.
In short, if you are looking for a pleasant screensaver to decorate your screen with, China Bay Screensaver may be a good choice.