Right, so a tiny back story before we actually get into things, I used Windows 7 heavily as I am sure most of you guys/girls have done so also.
I used to love the Windows 7 Basic theme, I loved it, it was perfect me, I just really enjoyed it, nothing else to it.
But a few months back I finally made the switch to Windows 8, not because I wanted too, mainly because of the performance boosts that it gives and what not and I searched high and low for a way to get the Windows 7 Basic theme onto Windows 8, but to no avail. If you're wondering what the basic Theme looks like, here's an image;

And I bought Plague Inc: Evolved recently, and I was watching streams, working and because Plague inc isn't exactly a game that requires a whole load of attention I thought I'd put it up on the second screen and work, while gaming, while watching some streams.
Suffice to say, I put it in Windowed mode and then this happened:

When in windowed mode it was using the Windows basic theme, bear in mind that I am on Windows 8, so my question is this.
For this to happen, then obviously this theme is integrated somewhere in Windows 8 and because of this, does anyone know how to activate this theme for Windows 8? I'd love if anyone had any more information regarding this because I would love to use this theme again.