I'd forgotten where I found this, but after I deleted my shortcut to it I figured I should make a note of *where* exactly the screensaver engine lives so that I can make such a shortcut again when need be.
/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app
You can of course use Hotcorners to activate this but I found having an icon in the Dock a tad more specific (one accidentally activates the screensaver when using Hotcorners and if u have "use password on wake" on then it starts to become annoying.
