It may be illegal in VA
And probably all other 50 states
and I would be very surprised if you have actually researched the laws of all 50 states. But here is the Florida State Statutes regarding vehicles and traffic laws. http://www.leg.state.fl.us/statutes/index.cfm?App_mode=Display_Statute&URL=0300-0399/0316/0316ContentsIndex.html&StatuteYear=2012&Title=%2D%3E2012%2D%3EChapter%20316
And here is your answer:
http://www.leg.state.fl.us/statutes/index.cfm?App_mode=Display_Statute&Search_String=&URL=0300-0399/0316/Sections/0316.224.html"(1) Front clearance lamps, identification lamps, and those marker lamps and reflectors mounted on the front or on the side near the front of a vehicle shall display or reflect an amber color.
(2) Rear clearance lamps, identification lamps, and those marker lamps and reflectors mounted on the rear or on the sides near the rear of a vehicle shall display or reflect a red color.
(3) All lighting devices and reflectors mounted on the rear of any vehicle shall display or reflect a red color, except the stop light or other signal device, which may be red, amber, or yellow, and except that the light illuminating the license plate shall be white and the light emitted by a backup lamp shall be white or amber. "
Similar would be
http://www.leg.state.fl.us/statutes/index.cfm?App_mode=Display_Statute&Search_String=&URL=0300-0399/0316/Sections/0316.235.html"316.235 Additional lighting equipment.—
(1) Any motor vehicle may be equipped with not more than two side cowl or fender lamps which shall emit an amber or white light without glare."
Besides, it is just common sense that putting green lights on a vehicle is a bad idea.