I have recently put eyebrows / eyelids on my car' headlights and I was wondering whether you needed to report this to the Zurich Strassenverkehrsamt or do anything else, i.e. report it to car insurance.
If my memory serves me correctly all modifications to the normal running of the car need to be registerd with the Strassenverkehrsamt hence I suspect you have to register your change too...BUT I'm really not sure
From what I've heard you only have to declare things which might affect the performance of the car e.g. ECU chip, exhaust etc.. stick-on adornments should be OK, however they might be frowned upon during the motor vehicle inspection.. or even prohibited.
I don't get it: you actually pay to dim the lights and make the car look half asleep and this improves nothing, but could mean the car fails the test. And the upside is??
I can't help with the Swiss rozzers and headlight thingies, but I can give you some furry dice, an arial with a golf ball on top and a Rizla Racing sun-visor to complete the street car look