Neons....Under car, under bonnet, under seats
Racing Stripes
Cut springs for hectic slammage.
Heart shaped exhaust tips.
Hektic autobarn wooden steering wheel.
Seriously though as said above a nice subtle set of alloy wheels and a good cut and polish to really make the paint shine would be the best start. Nothing worse than seeing people spending money to do up a VS with the classic faded/neglected paint job.