First of all I would suggest never to Indulge anything not permissible by Google in case of Google adsense. Otherwise you would never have second chance to think over, which ads pay what. It is advisable to let Google decide what it has do with your site ads, if you are using adsense.

For better earning though Adsense, you must concentrate on the Ads format. Test every format for your site. As google suggest to do that. It can make the CTR go thru the roof. Rectangular ads, skysrapper, No horizontal ads etc. Test it and see what works for your site visitors and you will see more earning from your site.

So instead of doing something not permissible, do something which will keep your income coming months after months, and mind it in bigger check :)

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