Different colours for adsense?

Hi, i'm running a wpmu installation, with some themes and plugins. I'd like to use the ad sharing plugin, but the adsense should have a colour which fit the current template, i cannot set an ad equal for all the themes, because users would see that they are ads (as the link colour would be completely different from the ones in the theme).
Is there a way to fix this? Like a plugin to fit adsense colours based on themes, or stuff like that
I'd also avoid to set a different adsense code for each theme (they're quite a lot), and the adsense limit IIRC is 200