As you know, last year, Google switched the AdWords ad label from yellow to green - well, maybe Google is bored with the green now.
Matthew Barnes spotted Google testing the ad label in an outline green, which makes the ad label more white and less noticeable. He posted this screen shot on Twitter showing the difference.
Here is what we are use to over the past year:
I kind of like the new version, do you?
Forum discussion at Twitter.