Admob 4.1 for Android: Changing background color

Im trying to change the background color of the ad to make it fit better into my app. I found that th开发者_JAVA技巧is could be configured through their web page, but for some reason this does not work 100% of the time, sometimes the ads appear with their normal looks.

So I choose "Use colors set in client code" and tried to change the ad-look in my app, but I have been perfectly unable to do this. I found many good guides for pre-4.1.0, but none for this version. Any help is really appreciated.

Cheers,

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It did not work when admob filled their adspace with ads from google ads. Turning off this filler made the ads always look the way I wanted, but then the fill rate was disasterous.