Here in the Great state of Oklahoma the licence plate is used by many to advertise to the public. ie.(Auto dealers) or to support the College Football team (OU, OSU,SWOSU,etc.)of your choice.
They come in any color or pattern of your choice. Or with the christian symbols of your choice, (Jesus lives,Jesus loves, Jesus Saves ) How about the one with a scrolling message.
I do beleive the ones with the flashing or blinking lights to be outlawed in Oklahoma.
You mentioned you had an idea tucked away for a new lics. frame you may look into a copywrite first, before you make it none to anyone. especially anyone on the production side or the marketing field... you'll thank me later..