Racing strips look good on most cars. They hint back to the sporting heritage of years gone by as these 2 classic photos show. 

Ac Cobra sporting a contrasting racing strip which accentuated the distinctive nose shape of hte Cobra.

Most cars with racing stripes use a single main strip with a smaller accent stripe parallel to it running the length of the car. Blue strips on white cars like this GT40 look fantastic as does a white stripe on a blue or black car. Experiment in photoshop first and the stripe can also be placed off center like in the new Clio sport models.