Well, it turns out that New York has a pretty nifty feature right on their website where you can enter in plate numbers and it will display the plate
if it is available. Well, it turns out that the plate is made up of several different small graphics, that can be easily downloaded and then combined in a graphic editing program, to look exactly like the real thing, only saying anything you want.
Here's two of the ones I did, I just printed them on thick photo paper and glued them on. I know I'm not the first to do them, but I think they came out pretty good, so I gotta show 'em off.

It was hard for me to get a good pic, but the one on the MINI says "RICE SUX"