Google should have a black background, so it would save 750Megawatt-hour a year.
But hey, more and more people are using tft/lcd’s aye? Oke, for the people using an oldstyle crt: Google black. Save the planet!

Comparisation: 74 (black) – 95 (white) watts
Read:
Google news (Dutch)
DOE Energy Star Desktop Information
Black Google Would Save 3,000 Megawatts a Year

hmm: Coca Cola Blak? (images/wiki) btw: donation of a full of empty coca cola blak bottle to me will be appreciated!