Slide show screensaver with many more options than the built-in one
If you are looking for a "slide show" or "picture flow" screensaver that offers you more control over the display than Apple's built-in screensaver, then ArtSaver might be right for you. It is mostly geared towards people who want to see their image collections (such as beautiful landscape shots or fine art) as large as possible, and with the info which images they are seeing.
Like Berkeley's old After Dark.
Place a beautiful water effects as your desktop's screensaver.
Turn your Mac into a minimalist clock.