Amusingly enough, I wish I had one more of those little seats that you find in the back near the emergency door. I may use the one I have, and I might find a use for one more. My garage is full of seats now...
Of course, it'd be awesome if I could find a recliner or some other really comfortable "furniture" type chair for my wife... something that would be safe in a collision. (Not that I anticipate getting into a collision, but you never know...)