Walls:
Snow walls: i think snow walls would be nice make some igloos im currently watching Sips new series and well with snow walls(igloos) im sure a snow map would be more enjoyable to play giving everyone variety
Glass walls: it is wat it says lol...complete glass wall in my opinion the windows are a bit small so having a glass wall like one big window outlined by stone or wood would be nice(2 glass and 1 wood or 1 stone to make?)
Doors:
Iron Door: cant be broken by enemies?...(3 iron to make) it would look better with stone so it would work with the OCD people like myself lol if you base your town on looks sometimes
Colored Door: again it is wat it says lol...kinda like the colored road just doors(specific color and 3 stone to make)

