I've looked again through this thread.  I think the proposals I like best are

- Nick Moffitt  https://groups.google.com/d/msg/pandoc-discuss/1bKIuyBnWaQ/7_D-ZkLQDQAJ
- Kolen Cheung https://groups.google.com/d/msg/pandoc-discuss/1bKIuyBnWaQ/mdXTzRrpCQAJ
- Insane https://groups.google.com/d/msg/pandoc-discuss/1bKIuyBnWaQ/8O_nA3kfCgAJ
- BP Jonsson https://groups.google.com/d/msg/pandoc-discuss/1bKIuyBnWaQ/tAAZmfEOCwAJ
- Albert Krewinkel https://groups.google.com/d/msg/pandoc-discuss/1bKIuyBnWaQ/PwwweE8vDQAJ

I'm not sure voting makes much sense; there aren't enough
people participating in this discussion, and anyway pandoc
isn't a democracy.  But maybe we could converge on one or a
couple of these.  (Nick Moffitt's suggestion from a long
time back was never developed in a graphic way; it remains
ASCII art.  It would be interesting to draw a stylized
version of that, which I think might be nice.  And of course
it's nice that you *can* draw it in ASCII art.)