That photo is really nice. Try my fotki link below for some more ideas. Go to the "Pinstriping" folder and there are more than a few sedans with stripes on the back.
All this stuff is cool, but as a pinstriper myself I feel that pinstriping should be a n accent to the car, not a feature. Get something cl***y done like fellow striper Fredrick Soderlund did here in this example...clean and crispy lines always rule hands down!
Here's a little better picture of pinstriping - before I installed chevy lights and license plate. Shows frenching of lights and plate.