Please take a look at my Ad Placement on my site: http://www.boredgames.co.uk And tell me what you think. Thanks
I think you should work with colors used in your website design. Try another color combinations to make Google Ads more visible. I also support an idea to put adsense within your content!
You can't modify the ad itself. But I think you're ok when you put it next to a button. Just don't mislead people. TextAds worked out well for me. They really blend in with the text. When your ads are relevant, visitors will be interested in them. But they usually overlook them when they're at the side of a page. Visitors do read ads when they're placed between two lines, for example.