I am yet to see a person who doesn’t like google logos. Best part of google logos is it conveys an idea so effectively and yet remains uncluttered. Talk about subtlety !!!
Today the new google logo celebrates Barcode . There are some google logos which we might have missed,  simply because we live in a different country. The reason being google filters their logo by the country from which the request comes in. To see them all, dive into http://www.google.com/logos/

Few men of genius are keen, but almost every man of genius is subtle