in all seriousness......you'll do yourself a major favor if you have the bodykit painted to match the factory car color.....
if you want to try loud colors, I HIGHLY suggest check out DipYourCar.com and do it using a plasti-dip kit. It's totally reversable and won't devalue the car by permanently changing the color. This also gives you the possibility to change the color whenever you want, by simply peeling off the dip and applying a new color.
My majorly huge hand-made Focus RS replica build:
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My RS conversion is For Sale: http://www.focusfanatics.com/forum/vehicles-sale/578185-sale-rs-mk1-conversion-2003-focus-svt.html