Maybe some of the antique furniture could be made wearable as well for the rooms. The upright piano from the music shop could as well.

This would be a great alternative to homes which a lot of people have asked for over the years. It would also be a lot more fun because we'd be wearing our home creations.

EDIT - Was thinking about the number of items per layer and came up with these possibilities -

1. Windows come complete with wallpaper and curtains.

2. Separate wallpaper which covers the width of the background for those who don't want windows. A doorway showing another room could be layered over this.

3. Furniture like tables and chairs etc would go on the ground layer.

Yes, please, to everything that can enhance our backgrounds to make them look like rooms. Rugs, carpets, maybe some different sort of wainscoting, more wallpaper, posters, curtains with some transparent windows so we can layer backgrounds underneath to look like they're looking out. Doors, just windows, just curtains. There are a lot of possibilities. :3

Added to the OP.

I'd love some wallpaper for my avatar. Floral pattern in pastel shades.