Vista is a Japanese style town with a bad name...
Chocolat is suppose to be a sweets-like town, but only the outside seems like it.
Moonview is a forest town.
Flora has no theme.
Ume is a bamboo forest town, I guess...
Faebi has no theme just like Flora.
I have two towns. Sakura is a partially zen-themed town, but there is also a residential section that has no theme. Nocturne is my new town and I'm still just in the beginning stages of building it, but it's going to be a Victorian-esque, semi-gothic themed town.
Mine is going to be a farm town! I had the idea for that years ago, and I've attempted it many times, but I'm going to try to really do it this time. I'm not planning on getting upgrades for town hall or the train station... I like them the way they are!
I don't go for any of the ordinary themes the game presents you. My main town is horror-themed, and I also have a hybrid circus/magic show town and an all-bird town that has representatives from each of the different bird species available.