My co-worker and I are making a language, so I decided to make a flag for it. Perhaps one day, we'll even have our own micronation.
It has a fairly standard 2:3 aspect ratio, features my co-worker's favorite color, the letter ⟨o⟩ from our alphabet, and the inverted logo of our workplace.
The overall design has connotations of a cassette tape, an envelope, and the Duolingo / Glossika owls.
Please, forgive the terrible stitching. I have nearly no experience with hand-sewing.