Universal colour (appearance) schemes?

Is there a possibility of having a universal theme, across all components? For example, a dark theme for Writer, Calc, Draw, etc… I know that there is a colour scheme selector at the moment, but it doesn’t seem to make it seamless (for example, row headers in Calc remain the same, as does the margin selector in Writer)…

Is there a way to do this at the moment? Or is this a potential future feature?