Please read: It's just a unofficial mock-up. I'm not part of LibreOffice development team.
Made in Inkscape / Gimp.
GTK2 Theme: Atolm by SkiesOfAzel -> [link]
Native Icons: Faenza-Dark by Raul Vega -> [link]
I hope you like it and give me your opinion. SVG included, then everyone can to edit and share a modified version under Creative Commons License.
This work is licensed under a Creative Commons Atribuição 3.0 Unported License. -> [link]
Take a look on the light version...