A Royal Gazette announcement which slipped through my normal searches was published on February 18 already, giving the graphic for the special car license plates in Chonburi province (Gazette). As Rikker already pointed out in a comment on my first post on these graphics, they are only available for those who buy a special number in an auction. Car license containing auspicious numbers, single digit numbers, or those where the two Thai letters form a real word are so popular that they are auctioned and are a kind of status symbol making the luxury car look even more worthy. However so far these graphic plates seem to be very rare yet, I haven't seen a single one in my latest trip.
Not much surprisingly, the graphic for Chonburi features a beach scene, as the tourist hotspot Pattaya is located within this province.