Google this week has been busy testing new colors for the ad label. Last year they went from yellow to green with the ad label. This week we spotted Google testing green outlined ad labels and also a black ad label.
Now, @addicted2ppc shared a screen shot on Twitter showing an orange ad label:
Orange really does stand out more than the other ad label colors, don't you think?
Here are the others:
Forum discussion at Twitter.
Update: This might not be legit, I am not sure if this was faked by the user.