The weekly item giveaways seem kind of aimless at the moment, which is fine in the short term but longer term it might be a good idea to give some thought to themes and collectible items.
People could sign up for clubs and get additional boxes full of specialized items. World flags, busts of musical composers, fighting planes or ships, things like that at first -- one or more free item every week, day, M/W/F, whatever.
It doesn't have to be a horrifically predatory exercise in gouging users, just a way to get people interested in logging in and invested in their spaces.
It would be important to have display options for these items. If you're handing out fighting planes, you want people to have display stands or some way to lock those planes in midair if they're tiny models, or a personal air & space museum if they're full size. If you've got little dinosaurs then there should be a suitable diorama (or more than one diorama) to put them in. You don't want to dump these items into people's inventories have them just sitting on a table or on the floor.
You'd also want to be able to track these things in-Home. Like, maybe your collection of world flags goes on a giant wall-sized map, but maybe you also have a smaller sheet that lists all the items that make up the collection and checks off the ones you have.
Stuff that are probably free and could work well:
- Fighting planes & ships
- US presidents or world leaders
- Cat & dog breeds
- Mythological figures
- Plants, birds
Licensed material that would probably be a goldmine:
- Architecture, like what Lego has
- Book covers, album covers, video game & board game boxes
- Movie posters
- Star Wars, Star Trek
- Warhammer 40K