I like the new label - CTR has gone up. No more "ads by gooooooooooooooogle" crap messing up my sites!
No notice in CTR, but sometimes I love it - sometimes it looks gaudy.. I liked the change though. As a webmaster it shows they're changing stuff around and that's usually a good move (have to remember.. it _IS_ adsense lol)
it's good with the background is white, but for other color it will not efective to increase earning or CTR.