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Maybe if you change the 'google_color_bg' setting to 'transparent' that would do the trick?
If not, i suppose your best bet is to take a look at the adSense documentation. As far as i know, google will let you customise the appearance of the adblock pretty much anyway you want.
Although, it would be kind of dangerous to allow a transparent background, as that would be an easy target for abuse (black background underneath with black adtext)
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