Serves: As many as you like.
PrepTime: 1.15 hours
Cooking: All night laughs
1 hour: If this is the first time you have done this, create an album on your iDevice Photo Stream and start adding the photos you want to have show up on your AppleTV.
15 mins: Go into your AppleTV settings and change the screensaver settings to show the photos found your Photo Stream Album. This will automatically update whenever you add new photos to it.
Enjoy the meal.