I just got back into the game after being gone for a little over two years, so I'm sorry if any of the following ideas have already been posted and knocked down for whatever reasons, but I personally am really into the idea of having a nicely decorated home. With that in mind, I had the following ideas that I'd love to see in this game:
Containers for humanoid housing which look like old school treasure chests. They would be useful to guilds or even everyday use because they would hold a very limited amount compared to vaults but can allow you to transfer items between other characters on the same account and/or other players (perhaps in your guild or randomly snooping through your house!) Chairs and beds which humanoid characters can actually sit on when they get close enough to the furniture would be awesome to see in houses.
As for new items for dragons, perhaps we can have a nest add-on which basically acts as a bed, made out of twigs and bones, making your dragon curl up and 'rest' when you step onto them and also an add-on which appears as a pile of treasure/s for dragon lairs which acts as a container (with the same concept as the humanoid chest). Perhaps us dragons can also have some lair deco in the form of blood splatters on the walls and floors.
Also, for humans.... various paintings as wall deco?
If you have more ideas.... please do keep 'em coming