I've got to give you 10 out of 10 for trying... but personally I wouldn't risk it. There must be a fine line between blending and cheating. One thing's for sure though, it'll probably get lots of clicks.
Wellllll - the menu box IS a bit different color background... have you changed it since the warning?
The navigation links text and the ad promixity and font size look very close to each other. Maybe change the color of the ad?
Venturefox, do you think you could find where you saw this without too much trouble? I'm curious about whether this is true or not. I saw some well-blended ad boxes the other day that were slightly, slightly to the left a bit compared to an identical menu right below. At the time I thought, 'This guy should slightly tweak it so those two match up perfectly.' If what you say is true, then he was right all along. I'm really curious to see this confirmed.
You can use the 'test' code if you ask Google for permission first. Always follow what Google says in their emails to you regarding the ToS rather than trying to argue with them.