I have several friends that play Lord Of The Rings Online and they have Kin (Guild) House that they can upgrade with the help of all the guild members. Maybe have the Guild Leader have control over the over all decorating and design of the house.
Maybe have a Throne room, armory, Trophy room (Maybe when your guild kills a World Boss or completes some Ops they get a trophy added to that room to show they have completed this Op or defeated this World Boss. Have rooms for guild members. Seating around the house that you can actually use much like the commanders chair in your ship. Dining room, maybe a Ballroom, Hanger bays. Those are just a couple of ideas.
I'm sure as people see this there will be more ideas.
Now on the matter of the cost and time it will take to make this kind of an update everyone would need to understand something of this magnitude couldn't be free. Maybe a $10 DLC or something. Have to make it reasonable for everyone though.
Thanks everyone!
Best regards,
Mori