Re: nurburgring badge?
If you really want one, I'd go with silver and put it under one (or both) of your side indicators. To make it really different, how about putting one of the small size cloverleaf badges in the middle of the 'ring badge? That might actually look quite cool!
Personally I wouldn't put one on the bonnet or even on the rear bumper. That's where god-ists put their Jesus messages and the Corsa brigade put their max power stickers on...
But then like most Alfisti I'm a purist when it comes to appearance.