So this next feature I don’t personally have much use for but it may be useful for some of you. Basically, with older versions of Visual Studio, you would have multiple instances opened and you couldn’t distinguish between the active and inactive ones:
Now in Visual Studio 2013 you can distinguish between multiple instances:
It works with all the themes. Here is what it looks like if you are using the Dark theme:
I think this is one of those features that you either love or just don’t care about. If you work with multiple instances often this could be a big help.