I'm assuming you're referring to wordpress adsense themes.

Doshdosh did a roundup of 18 good adsense-ready wordpress themes some times ago, and its pretty good. Check it out:

18 Adsense Optimized Wordpress Themes to Maximize your Contextual Ad Earnings

Thanks Ojami for the Wordpress information.

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i also use doshdosh adsense themes and it really nice and so much user friendly.

There are loads of adsense themes on wordpress and specially 3 column themes made for adsense purpose so search for "Free Wordpress adsense themes" on google and select the best one suitable for your website specially according to your niche.
Thanks
Webmatic

I would say yes to dosh dosh adsense themes. You have to take some time to test your ads on your website to find out whether it is able to increase your CTR.