I can't tell if you're being sarcastic or these are genuine concerns. Black is not my favorite design color but I think it works well for Google and contrasts well in this case.

The black bar at the top is like working at night time, Google (the content) being the light that guides the way. Blue bars work well on the bottom, giving the feeling of floating peacefully in the ocean, yet at the top cause distress - as if the user is drowning. Yes, I'm making this shit up and trying to sound as ridiculous as OP.