I know there are a few options when you press Q already, but I was hoping that new wallpaper designs could be added?
Like striped wallpaper, or floral, or ducks! I think it would really brighten up the walls. 
Rugs would be lovely too; as furniture you could buy in game, rather than a wall skin.
Like a rug shaped like the cat sack, or a snake, or the dog and cat faces from Planet Panic maybe. 
Essentially, the more customisation options, the happier I shall be. 
I realise there are more important things that need to be done at the moment, but I would love it if these were implemented. 