How to get the nice Unity Look

I’ve seen the nice grey unity look in tutorials such as this
http://www.carlk3d.com/wp-content/uploads/2013/07/Unity-User-Interface.jpg

However mine doesn’t have it. Instead its an ugly grey and this bugs me a lot.

I attached a png of what mine looks like.

Is there any way to change its style or am I stuck?

The dark theme requires Unity Pro.

If you have Pro, it’s in Edit->Preference->General->Skin

Thanks!