I have 400K on cookies, I think a good idea would be to make the couch customizable, to be able to change the colors of the couch, or even the model, to change Nemo for any other Character you already have, change the snacks he is eating, the cups he is drinking, even adding a carpet or a lamp, or things to be around the couch, things like that.
And make this things cost cookies, so that way your lobby is customized and if you invite someone to your party they can see your couch, and whenever you are in the main menu, you can also see your couch.
So... that's the idea.