There is a company that will custom paint your iPhone, for more than it costs... Just the paint job is 400USD... Who in the right mind would even buy that service? I suggest you use painter's tape to cover the screen, camera, button(s), and earpiece, then spray paint it
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Disclaimer: I am not responsible for anyone who chooses to do so, and do not do unless you have covered a Meizu M8 in paint before.