Reimplement the Titlebar

I'd like to design some cool user interfaces and I am interested in... somehow the way they are.

Now I was wondering,

is a good idea to redesign the Titlebar of desktop applications?

What I mean with that is to get rid of the standard Titlebar of boring Windows and redesign the Titlebar together with these "Close, Maximize, Minimize,..." actions in a nice design.

What I can think of, is that some users may be confused and don't find some standard actions, on the other hand, if you implement it in a good fashion, your application stand out from others and may let the user have a really comfortable workflow.

Thanks for your time!