Have seen quite a few different cars on the road recently 'sporting' some design of stripes running lengthways over the car, from bonnet to tailgate (various make/models of car).
Considering 99% of these are your run of the mill, A to B, weekend supermarket shopping cars too - so tacky ...same goes for the union jack (flag) design on the top of new Minis!
The Black roof could look half decent - subtle yet stylish. A little like the japanese sports cars that have the black carbon fibre bonnet - at least this is designed for performance too!