En FromLinux We have already posted several articles on some proposals that various users have designed for the interface of LibreOffice / OpenOffice.
From my personal point of view, I think that the weak point of this office suite is precisely its appearance, which bears resemblance to old versions of Microsoft Office since its inception.
Well, a user who calls himself black elgat posted on Gnome-Look a kind of app written with gtk3 that allows us to see how your concept of graphical interface for an Office Suite works.
If you want to see it in action, here is the video:
http://www.youtube.com/watch?v=ctLfh7TpTOM&feature=plcp