- Suphanburi [Gazette]
The dragon from the new Chinese heritage museum next to the city pillar shrine was added to the previous design. The other element easily to recognize is the observation tower in Suphanburi city. I am not sure what the various animals stand for, they might point to the zoo and aquarium at Bueng Chawak.
- Khon Kaen [Gazette]
The license plate shows a dinosaur, referring to the Phu Wiang Dinosaur Museum. The dinosaurs first discovered in the hills of Phu Wiang have their scientific names pointing to their Thai origin - Phuwiangosaurus sirindhornae, Siamosaurus suteethorni, Siamotyrannus isanensis, Kinnareemimus khonkaenensis. The flowers are from the provincial flower, the Golden Shower Tree.
- Nakhon Phanom [Gazette]
The design for Nakhon Phanom shows three boats floating on the Mekong river.
- Phitsanulok [Gazette]
The license plate for Phitsanulok is rather crowded. The flowers in the middle are probably the flowers of the provincial tree Millingtonia hortensis. To the right is the dam of the Huai Nam Khem reservoir. The cock below it is the Naresuan Fighting Cock, the local breed of cock. The rafting boat refers to the Khek river, said to be most difficult of all rafting rivers in Thailand. Phitsanulok has several waterfalls, but from the photo in the Wikipedia article the one depicted might be Kaeng Sopha waterfall.
I am slowly filling an album with all the designs, including the ones which were updated already. It seems there is no good website which collects them all in a reasonable resolution, so it seems I can fill a gap again.
But the best ever license plate in Thailand was posted on Twitter quite some time ago, but you'd need some Thai knowledge to get its meaning.