Screensaver after morning wake
It looks like running the following command in Terminal, or supposedly through a script, will start the screen saver:

/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine


You could then schedule the screen saver to run a couple of minutes after the time the computer is scheduled to turn on. See this SuperUser question for some alternatives for task scheduling in Mac OS X.