Is there an easy way to shift my whole game down?

I’m using the unity3d admob plugin (it has a prefab you just drop into scene) from here:

It works really well. But it overlays my game and I don’t want my user to be distracted. Is there an easy way to shift the rendering of my whole scene down by 100px or something like that so the ad is rendered in front of blackness and not my actual game?

You can either add a black GUI Texture behind the add, or, as robertbu said, just change the camera viewport size, and add the desired y-offset to all GUI coordinates.