A gallery and game assets/models as trophies
Because the home space is very limited it could get hard for some people with a larger library to display all their achievements/trophies. A gallery/trophy hall could help with that.
It could be a picture where people can walk through and are transported into a hall.
Unlockable game assets/models, tied to achievements (or playtime)
could act as trophies for harder achievements and would make the gallery more interesting.
Something like the robot models from robo recall, the robot wobble head or the figurines from luckys tale...
A lot of the weekly items would really benefit from a gallery environment. I have a bunch of paintings, but the home area really doesn't have that much wall space. Likewise, there's not really a good display option for all the game cases, miniatures, cards, etc.
For example, we have all these game cases/cartridges, but the only room we have to work with is basically an outdoor-facing living room. A second room model for an enclosed game room would be a much better fit, and would be a natural fit for future items like TVs, computer screens, desktops and tower cases, mini keyboards, keyboards with LEDs, etc. Just tons of stuff that would look out of place in the one room we currently have available. Likewise, a kitchen or restaurant environment would take well to food and cookware, a yard or sunroom for plants and gardening supplies, a personal library for books and other media.
Back to the original point, a good gallery environment would be a large, open area, with user options for walls/partitions. In addition to the options available for floors, ceilings and walls, lighting would be important -- sunlit, bright, dim or completely dark except for the exhibits. Future tech would enable a larger space, with multiple floors and more polygons -- you want to be able to create your own dinosaur exhibit, or an air & space museum.
We need to be able to share multiple versions of the same environment, though, or else a gallery doesn't do much good if we want to create more than one, with different exhibits and different decor.