(or if image link doesn’t work - https://scruss.com/blog/2018/12/17/they-wont-miss-our-table-at-the-next-mappy-hour/)

How to make this: Edge Lit Acrylic Frame - 100 × 100 mm by scruss - Thingiverse

Logo derived from Monochrome sticker on OSM logos page. Would be happy to share if anyone wants it.