Of the certainties in life, such as life, death and taxes, is the fact that LibreOffice needs a new interface. And that's not me be being picky, but supportive of open-source's premier office suite. The 'good news' is that LibreOffice developers know this and discussion towards overhauling the tired look of the application set have been ongoing for a while. Amongst the interface proposal currently being discussed on the LibreOffice mailing list is the modern-looking 'Citrus'.