My mayors house for Eventide has each room loosely based off of a sunset/stars/night sky, as well as being based on functional rooms in a house. Most are still unfinished though...
Main room (living room): Kiki and Lala items mostly. I will also have pink and yellow marshmallow chairs surrounding the two tables in the middle, plus a few extra furniture pieces to make the room more lively.
Upstairs room (bedroom): Lunar horizon wall and cloud floor to give the room a starry sky look, lots of regal blue furniture, some toys (more will be added) and there will eventually be a reading corner too. I'll probably use some princess furniture when it's finished.
Left room (kitchen): Harvest wall and floor, A massive cake in back as the focus, with lovely furniture refurbished with nebula shirts whenever possible. There will probably be sweets furniture if I can fit it in.
Right room (bathroom/laundry room): Ice floor and mermaid wall, along with any mermaid furniture that has stars on it and some ice furniture. I also have the cloud making machine from the Kiki and Lala set as the washing machine, and some laundry items like the towel basket and clothesline pole. I also have a claw foot tub refurbished blue and an aroma pot.
Back room (dressing room): Cityscape wall and regal floor, with gothic black rococo furniture and a full moon vanity. There's also my mannequins and some clothes and shoes.
Basement (game room): I'm not 100% sure where I'm going with the game room! There will obviously be my WiiU and stuff, and I put some arcade items down there, but It's mostly just random! I'm thinking maybe an outdoor/nature styled room so that I can put my desert island furniture in, but I'm not sure what wallpaper to use since I don't want to reuse the lunar horizon.
I also have pictures of my mostly completed main room and upstairs room!