Google Adsense

Take away the border and background colors of your
AdSense ads. These make them stand out as ads rather
than information your visitors will be interested in. As said
earlier, your ads should blend into the page. By making
them appear as information you’re providing, you’re giving
them another point of interest rather than an ad that many
people might shy away from.
This screen shot below is a good example. The ads are
framed in a column as the rest of the page’s information is.
It is not made to stand out. They blend in and become part
of the content.