The Document Foundation (who manage the development of LibreOffice) have put out their annual report for 2015 <http://phoronix.com/scan.php?page=news_item&px=TDF-2015-Annual-Report>. Just glancing through it, I found that you can buy LibreOffice-themed coffee mugs, T-shirts etc here <https://shop.spreadshirt.de/documentfoundation?version=1471300568494>.