Is it legal to put green LED lights in the grill of my car?

Plus, is there a car besides a Pontiac firebird that is cheaper and will look good with the lights on the front? I am not trying to replicate the car completely. Just trying to do something fun and similar.
Update: Please be specific about off road and highway. Do you mean highway as in interstates or all roads in city limits? Plus off-road. Is it off interstate or a more specific dirt road? Please help me. I would really like to do this. I live NC by the way. If this helps.
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