Background buildings should improve decor

[my_hat_stinks]

Background buildings should provide a small amount of decor. They can improve the look of a room, but dupes don't seem to care. They're literally more impressed that the floor is made of floor.

Drywall for some reason uses twice the resources of a standard tile but is almost entirely useless outside of the space biome. Tempshift uses 4x the resources of a standard tile, but has it's own uses so it's not as bad.

Obviously it shouldn't be a huge boost since it would stack with buildings. A base decor of 5 with radius 0 (if that's supported, only applying decor to the tile it's on?) would make it slightly less effective decor than a basic tile but still provides a small incentive to pretty up the base a little.

In the future there could also be more decor-focused background tiles. Painted tiles, wallpaper, mosaics, etc.

Edit: Also the option to have the background tiles layer in front of water and gas pipes would be nice.