When you can't see the blinds for the curtains

Blinds. Curtains. Shutters.

What we have might be an aesthetic preference. A budget restraint. A functional requirement. A regional norm.

A simple element of our homes, with more than a minor impact on our enjoyment of the space.

Colour. Texture. Light. Warmth. Airflow. Weight. Material.

Typically, we seem to start with the preferred look, then consider budget. Functional requirements are usually not considered. 

How many other simple elements of our homes are treated this way?