Game Achievements / Trophies / Rewards in Home
Quick Idea. Allow game devs to create "Trophies/Rewards" that can then be placed in Home. Not flat pieces, but fully fledged objects. Echo Arena, for example, could reward you with an Echo Disc if you played for 10 hours. Since Homes are shareable it makes total sense, since Dev's get a bit of marketing and us users get fun stuff to place in our homes based on games we play.
If I saw something really cool in someones home, I'd go ... "I want that! and buy the game!"