In each room? Okay, that makes sense, I've had green furniture in the bottom of my main room, but I keep adding more rooms without putting the green furniture in them.
The folks over on GameFAQs are insisting the feng shui bonuses will kick in for every room. I've only been focusing on my main room myself. The HHA bonus for feng shui applies to every room but I'm not convinced the feng shui influence to other metrics does.
One detail I can reinforce from the FAQ is that pure green furniture, clothing and gyroids will have a greater influence on your FS score than items with a mix of colors. You'll want double greens in those squares instead of a green-blue item for instance.
You also don't want LARGE items in those squares as they only count towards your feng shui score a single time and eat up a lot of territory. Far better to have a bunch of single-square items.
Better yet, find small tables that have a feng shui score and stick additional feng shui influencers on top of them. Some tables may not even start off a certain color and can be shifted over to it. Grab a white minimalist mini-table, customize it to moss green and stick a double-green Luigi hat on top of it.
Or dress a mannequin up in a whole bunch of feng shui clothing and place it in a single square.
Find feng shui influencers that hang on walls and don't take up space at all.
Lastly, there's an artificial limit to the amount of items you can store in a single room. I hit it in my main floor last night which means I'm going to start clearing out space in my central area so I can allocate more territory to wall-mount/table padding.