I changed the AdMob style to custom.
Then, I set background, border, title and text colours. But, banner style didn't change in my app device.
What could be the problem.
Note I am pretty sure that I had the correct code and settings to do that.
Ok, after customising ads banner it took sometime to be applied. :)
Also, as an experience AdMob is not always applying your custom style to the banners. Sometimes the default style is applied!
You could have some Ads in your style and another one with the default style. All that at the same run of the app., same activity and same banner.