I'm very curious to see what everyone's themes are. I recently got back into the game, and restarted my town after seeing that I lost Julian after a long break, and I'm thinking of making my new town into a nature-y, rural little place, that's just peaceful and nice.
Mine is unorganized and messy, with patches of missing path QR codes randomly as well as items all over the place. I have, for a long time, intended for my town to have a lot of bamboo and for it to be a serene gentle town. It's too much work though and now all I have is bamboo growing everywhere without any particular fashion.
Forest-y. I was lucky enough to find a mossy cobblestone path that fits in nicely. Once I complete my "perfect town" and get the golden watering can, I'll let the weeds and clovers stay.
Nothing specific for my current town, but if I ever get a second copy of NL I'd make a farm themed town. Villagers like Gala (pig), Tipper (cow), Goose (rooster) etc and Harvest Moon type patterns like vegetables. I'm tempted to delete my current town for it but I've worked way too hard on it.
The theme of my town is sort of based around hibiscus the plant, so I plan for it to be full of hibiscus bushes and greenery here and there. Possibly like a jungle? but a bit more organised I guess.
Mine is fairytale themed, or so I think anyway. It may be a little bit subtle though. I have different elements from some of my favorite Disney movies throughout. I tried to stick to one theme but I love so many different aspects of the game that I would either have to have 5 different towns or somehow combine it into one haha.