I know a few simple ones, like if Salmon Faverolles have a lot of black then they are most likely boys. But not enough to write an article (yet!). Though I did find this thread you might be interested in: https://www.backyardchickens.com/threads/sexing-easter-eggers.785749/
I would love to see...
I think the next will start in a couple months, after this contest is finished being judged. Sounds like an interesting article! You could make a thread asking other BYCers for permission to use their pasty-bum photos.