What does the special "walls" do.

I noticed they added a few new walls in the housing section namely the Small, Medium and Large sizes of the following:

Arms Supplier's Wall
Outfitter's Wall
Eatery Wall
Mechant's Wall

Aside from changing your house appearance, does these walls have any other effect on your house?

These are like Glamours for the exterior of your houses. Even though its only one piece, It will change the appearance of everything thats part of your house.