2013-15 is the best one imo, it's minimalistic but still kind of fancy, I'm not a big fan of the new font. But hey, it's still the best search engine, so who am I to judge?
fun fact: Google is named after "googol," a number that is: 10^100, and the mathematician that came up with the number got it from his 4 year old son. That's right, Google is a misspelled version of a big number that got it's name from a 4 year old.
NO
NOT
COMIC SANS