1. Blend your ads. Adsense color and font size

1.i It’s tested and it works. Use the same colour of your page background, for the border and the background of the ad.

1.ii Use the same colors used in your page, for the Adsense ad title, text and url link.

1.iiia If possible use the same font in your page, as the Adsense ads. Since the ads have variable text size and font, according to dimension and type of ad, you can never do this 100% right. But every little bit helps.

Real life Adsense font size and type

768×60 Ad unit:
Title: style="line-height:12px; font-size:11px; font-family:verdana,arial,sans-serif"
Description: style="line-height:12px; font-size:10px; font-family:verdana,arial,sans-serif"
URL: style="line-height:12px; font-size:10px" face="verdana,arial,sans-serif"

300×250 Ad unit:
Title: style="line-height:14px;font-size:11px" face="arial,sans-serif"
Description: style="line-height:14px;font-size:11px" face="arial,sans-serif"
URL: style="line-height:14px;font-size:10px" face="arial,sans-serif"

As you can notice above, some ads have the arial font as default, some have verdana. Some have a 10px description text, some have 11px. And besides all that, each box may contain 1 up to 4 ads, and depending on that the font sizes will change. So it’s really up to you to experiment and see what works best for you, in as many cases as possible.

1.iv Try to not separate the ad from the content (like trashing the ad in some remote corner of your website. Integrate it within the content (in, within, next to, above, below etc).