Here's a very basic konsole mock up, I used a solarized background otherwise it would be way too bland and most people do use it with a darker look.
{F8683902}
I don't know if the tabs should extend the whole tab area or keep it as Breeze currently does. Edit: Full TAB is the way.
Some extra concepts:
{F8696248}
{F8696247}
{F8696246}
The last two are concepts for tile identification and control.