Personally, any wordpress template will do as long as it is simple and there are not a lot of distractions going on so that you'll get a high CTR on your adsense ads. You can do a Google search for "adsense ready Wordpress theme". Hope this helps.
I am looking for such theme too. But it seems nobody will give it free. I think it depends on the site niche too. I once bought a theme that the seller guaranteed it will increase the CTR min. 5%. But it did not as expected. My ctr is still around 1-2%
There's someone who offered an adsense theme here: http://forums.digitalpoint.com/showthread.php?t=2147422
I agree with bulram that it depends on your niche and there is no specific theme for Adsence. There are few if you google it but no use of them. I recommend you to choose theme which is suitable with your niche and then place adsence. it will really help you a lot.
those themes almost seem too basic, but then again sometimes the more simple the better I suppose it's a combination of both, but I do agree positioning is a much more important factor
I usually use theme-junkie's templates..........But positioning of add is more important than template......