The "Libre" part kept reminding me of the word Liberation. So my proposal is based on a bird taking flight with the icon resembling a wing being stretched out. I kept the design simple as with the colours.
I hope this will be in next version, because I totally love it! I want it officially in new LibreOffice...because it's difficult to find this deviation always when you're installing LibreOffice
Your work is very good... i hope i can have LibreOffice (as i usualy used it) with your logos...
Have you thought how can it look with the Liberty Satue fire...???