Wouldn’t that be a good way to save energy? I wonder what a black Google search page would look like?
Update: Jyaif commented that the Google blog has a post about just this issue and it does. It turns out that turning the Google page black could actually increase energy usage in some monitors. The blog post then sets out a couple things you can do to reduce the amount of energy you are using by enabling the energy saving features of your computer and monitor. Thanks for the comment Jyaif!