I just found my feather, it was floating around in the air, like a mini tornado. It seemed to be moving around, however I found mine at X: 1034, Y:1137
http://i.imgur.com/LwqvUMu.jpg
Not sure if this have any relevance, but I got my feather shortly after midnight, so the feather might spawn hourly and disappear again if no one picks it up.