A few years ago - the state legislature tried to have a money grab and rolled out new plates (the ugly yellow ones) that were going to be mandatory for all to replace the previous generation (the white and blue ones) at a cost of about a hundred bucks a pop.
The white and blue ones have been in use for a little over a decade, having replaced the previous red and white statue of liberty plates.
Uproar ensued and the legislature changed course.
Now - any new registrations get the new Yellow plates while existing registrations can keep the white and blue plates. You have the option to upgrade, but it tacks on around $60 to your re-registration fee.
They were supposed to give a retro look to the plates, but instead just look terrible.
All of my cars still have the blue and white plates - I registered the last one a week before the switch was made.