Fancy Feathers

I have a small obsession with feathers lately – those little black feathers that have the white polka dots and are just down right awesome. What are they called? Anyone know? I first fell in love when I saw these yellow shoes from J.Crew but then Abby over at Life in the Super Burbs posted these Diane von Furstenberg sandals and it confirmed my obsession.
In my hunt for more of these feathers, I came across Etsy seller, portobello, who has created these gorgeous hairpieces. Besides the mannequins kinda freaking me out, they are fabulous!