Nintendo Miitomo Mobile Game Just Got a Huge Update That Lets You Send DMs, Decorate Your Room, and Use Multiple Miis. You can now add wallpaper and flooring to your room on Miitomo.
There’s also a new feature called Sidekick Miis which lets you use other Miis you have created – and decorate their rooms as well.
You can add “Posters” to your room – and possibly furnishings too (haven’t finished exploring everything yet myself). The Posters can be miifotos, or any photo saved to your mobile device. I chose one of my cats to use as my poster.