Google adsense code can be customized this includes changing the font changing the alignment of the ads removing the "ads by google
" title which will be at the bottom of ads some times at the top of all the google adsense section.
But i'm afraid this service is available only for the google adsense premium publishers and its not for all so hear comes the question who are google adsense premium publishers.
Premium publishers are those who get millions of page impressions per month and this status is given to you by google through mail if your page impressions turns few millions in a month so that you can customize your adsense code.
Now you can also blunder your ads so that you get better clicks.Adsense allows premium publishers to control the number of ads they want to display in there ads section and this is one of the cool features of google adsense