Heres some of my ideas.

Auto Racing Room
Some kind of racing thematic playroom. Thats it. Lets put some crazy pixpets having fun riding cars... or at least, intending to do it with remote controlled ones or with their own beds.

Cars/Racing Track Posters
Compact Toy Car Workshop
Toy Race Track Sets or a Big Race Track Decorative Scale Model
Toy Car Garage/Commuter Parking
Toy Plastic Cars (available in diferent models, sizes and colors) Can also be Karts or Motorbikes.
Car Shaped Beds or real life size cars, for Pixpets to ride.
Driving Simulator
Start/Finish Line Rug
Decorative Car Wheels
Decorative Rusty Car Doors
Racing Flags
Winner Podium
Trophies (Pixpet already have some of those item but more at more formats)


City Street Room
Some Room that looks like some city scale model, soo or Pixpets can play and pretend they are gigantic monsters like godzilla smashing some cities.

Road Cones
Road Signs
Parking Lots Rug
Pedestrian Crossing Rug
Road Signs, Traffic Lights or Traffic Signs
Bus Stop
Bus Replica, Cars Replica, Taxi car Replica...
Telephone Booth/Telephone Call Box
Different Buildings Replica (lots of those for high city buildings diversity)
Street Art or Street Graffiti for Wall decorations
Very big rugs simulating tracks or highways in different formats. (I know Tiles are not allowed in the contest rules, but some Road Tiles would be so cool in a room like this, so players could create they own road tracks. However, i think rugs can do the same trick)
I also was going to suggest street lamps but they already exist in game.


Skatepark Room
Decorative Bicycles, Scooters, Kick Scooters, Skates.
Colorfull Skate Wall Paintings
Skatepark Pipes or Standard Outdoor Mini Ramp
Skate Bed
Skate Replica for Pixpet to ride
Skatepark Sofa that looks like some Skatepark Pipe
Skate Table


Aeromodelling Room
Decorative Toys Helicopters or Planes
Airport Scale Model Table
Wall Hanging Planes
Tiny Aircraft model
Plane Bed or big planes for Pixpet to ride
Plane construction conceptual project ancestry painting


Golf Simulator Room
Rugs that look like outdoor golf camps or Mini golf camp
Golf simulator enclosure kit
Decorative chest full of golf balls
Big television with golf scenarios
Decorative golf stick/golf club
Decorative bag full of golf sticks/golf clubs
Golf paintings
Golf cart


Alien Themed Bedroom
Sinister Green Alien plushies, toys, decorations
UFO/Spaceships shaped Beds
UFO/Spaceships as toys or wall decorations
Other world paintings or Other world windows (landscape to other planets and universes)
Glow in The Dark Solar System Wall Decorations
Star Projector/hologram
''I want to believe in aliens'' rugs or posters
Giant metallic decorative UFO/Spaceship
Neon lights


Edit 1: Added Golf Simulator Room and Alien Themed Bedroom