3D Flip Clock Screensaver is a nice screensaver with a customizable flip clock. The screensaver offers multiple types of clocks that can display the time and date in a great variety of ways. You can customize the time format, color scheme and size. You can even select the font, background type and background color, but you won't be able to change the layout (flip clock). What is great about this screensaver is that you can preview your selections from the built-in previewer in the settings menu, so you can adjust your clock the way you like without the need of running the screensaver multiple times. The screensaver also features a moving camera effect that make it more attractive. However, this effect can be removed if you wish, and you can also customize the screen and render settings to support your computer resources.
In short, 3D Flip Clock Screensaver is a nice and fully customizable screensaver with a clock that offers multiple options to satisfy different tastes and never get bored of it.