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If you have the misfortune of being rearended, your insurance may have issue. Regardless of color non DOT signage on the lenses would be the problem. My neighbor used to park his car on his side of the street, facing the wrong direction, drunk driver sideswiped the car and totaled it. The insurance company said since the car was parked in violation of Calif Vehicle Code 22502,
(a) Except as otherwise provided in this chapter, a vehicle stopped or parked upon a roadway with adjacent curbs or class IV bikeways, as defined in Section 890.4 of the Streets and Highways Code, shall be stopped or parked with the right-hand wheels of the vehicle parallel to, and within 18 inches of, the right-hand curb or the right-hand edge of the class IV bikeway, except that a motorcycle shall be parked with at least one wheel or fender touching the right-hand curb or edge. If no curbs, barriers, or class IV bikeways bound a two-way roadway, right-hand parallel parking is required unless otherwise indicated at the time they would not cover the damage.
Get the wrong adjuster and investigator and there may be problems if your car is the wrong year:
Vehicle Code
DIVISION 12. EQUIPMENT OF VEHICLES [24000 - 28160] ( Division 12 enacted by Stats. 1959, Ch. 3. )

CHAPTER 2. Lighting Equipment [24250 - 26106] ( Chapter 2 enacted by Stats. 1959, Ch. 3. )


ARTICLE 15. Light Restrictions and Mounting [25950 - 25952] ( Article 15 enacted by Stats. 1959, Ch. 3. )


25950.

This section applies to the color of lamps and to any reflector exhibiting or reflecting perceptible light of 0.05 candela or more per foot-candle of incident illumination. Unless provided otherwise, the color of lamps and reflectors upon a vehicle shall be as follows:

(a) The emitted light from all lamps and the reflected light from all reflectors, visible from in front of a vehicle, shall be white or yellow, except as follows:

(1) Rear side marker lamps required by Section 25100 may show red to the front.

(2) The color of foglamps described in Section 24403 may be in the color spectrum from white to yellow.

(3) An illuminating device, as permitted under Section 24255, shall emit radiation predominantly in the infrared region of the electromagnetic spectrum. Any incidental visible light projecting to the front of the vehicle shall be predominantly yellow to white. Any incidental visible light projecting to the rear of the vehicle shall be predominantly red. Any incidental visible light from an illuminating device, as permitted under Section 24255, shall not resemble any other required or permitted lighting device or official traffic control device.

(b) The emitted light from all lamps and the reflected light from all reflectors, visible from the rear of a vehicle, shall be red except as follows:

(1) Stoplamps on vehicles manufactured before January 1, 1979, may show yellow to the rear.

(2) Turn signal lamps may show yellow to the rear.

(3) Front side marker lamps required by Section 25100 may show yellow to the rear.

(4) Backup lamps shall show white to the rear.

(5) The rearward facing portion of a front-mounted double-faced turn signal lamp may show amber to the rear while the headlamps or parking lamps are lighted, if the intensity of the light emitted is not greater than the parking lamps and the turn signal function is not impaired.

(6) A reflector meeting the requirements of, and installed in accordance with, Section 24611 shall be red or white, or both.

(c) All lamps and reflectors visible from the front, sides, or rear of a vehicle, except headlamps, may have any unlighted color, provided the emitted light from all lamps or reflected light from all reflectors complies with the required color. Except for backup lamps, the entire effective projected luminous area of lamps visible from the rear or mounted on the sides near the rear of a vehicle shall be covered by an inner lens of the required color when the unlighted color differs from the required emitted light color. Taillamps, stoplamps, and turn signal lamps that are visible to the rear may be white when unlighted on vehicles manufactured before January 1, 1974.
(Amended by Stats. 2004, Ch. 198, Sec. 4. Effective January 1, 2005.)

Sure, many have been doing it for years, if something really crappy happens, the details will emerge, especially if there are large amounts of money involved. Yeah, it's all good until it isn't....