I took Angela Walters craftsy class on feathers and loved it! I just added feathers to the border of a quilt I just finished and I was very happy with the results. She shows how to make the traditional feather and the custom feather and goes on to show how to embellish them by echoing or making ferns instead of feathers, etc., then she shows how to fit them into a block and also how to fit them into borders. It was a great class and I really learned a lot.
You can also take "video notes" which, when you mark them, takes you right to that point of the video. So it's a great reference tool.
I am sure you won't be disappointed if you take her class.