Do not forget the Toilet Principle, which applies to majority of software UI: Your user wants to be done with your thing ASAP, get what their came for and leave

Do not forget the Toilet Principle, which applies to majority of software UI: Your user wants to be done with your thing ASAP, get what their came for and leave. Any visual style is a bonus, if it doesnt get in the way. I guess it applies to majority of buildings and other things too.