Customize Vista Screensaver is a free tool which lets you add more effects to the existing vista bubbles screensaver, you can add shadows to bubbles, add transparent background, increase the number of bubbles. we had written some articles previously like get vista default screensavers on xp, Beijing Olympics Stadium 3D Screensaver, Save energy with screensaver, Latest News Screensaver and how to fix screensaver not running and lot more other tips you can search on our site.
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Similarly you can optimize other default screensavers of vista like Mystify, Ribbons and Aurora. This tool is very simple, small and portable. So, you just need to extract and run the executable file to get started.
Apart from this here is another trick to modify and tweak settings with some registry hacks to add more features to the default screensavers of vista.