Blue-colored lights are illegal

Flashing lights are not permitted.

Using neon lights of any color except white near license plate is not allowed.

Red or green light must not be visible from the front of the car.

Do not display any combination of white, red, and blue colored lights.

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[...] B.  No person shall drive or move any vehicular

equipment upon any highway of this state with any lamp or device thereon displaying a red or green light visible from directly in front of the center thereof.

C.  Flashing lights are prohibited except on authorized emergency vehicles, school buses, or on any vehicle as a means of indicating a right or left turn, or the presence of a vehicular traffic hazard requiring unusual care in approaching, overtaking or passing.

D.  No person shall sell a dashboard, hood, vehicle front grill, or vehicle roof mounted emergency light that emits a blue or red glow, or that emits a glow in any combination of the colors red, white, and blue, to any person who is not a peace officer, a firefighter, or a person employed in the performance of emergency or public utility services.  No person shall possess such an emergency light except peace officers, firefighters, public utility, and emergency personnel.