This is brilliant. For anywhere from $40 to free a radio ham can get their calls on their license plate. The free structure varies wildy from state to state but is well-documented here by the charming nerds at ARRL.
It's free in Georgia, Alaska, North Dakota, Rhode Island. And the fee averages under ten bucks. Only Kentucky and Wyoming stand alone at thei high end and only New Hanpshire charges based on some weird book value equation.
To receive Amateur Radio plates, a copy of the operator's FCC Amateur Radio Operator's License must accompany the request, and the requestor must state that it is current. Upon revocation, abandonment, or transfer of the license, the plates must immediately be surrendered to the DMV or the transferee. Yadda yadda.
Its written about online everywhere but the best gallery I found was this one: