Just in case you thought I was getting too girly on you . . .  I was inspired by a tweet by the adorable Little Bean Shop from last weekend about living the pirate life.  (You should check out their shop if you haven't - definitely watch the video on the homepage.  I adore the song.  Sounds like something Vivi would sing if she could, haha.)  The shop that sells the Jolly Roger flag above also offers custom versions, if you prefer a different design.  It's fairly large and would be a great option to hang over a crib.

As a side note, this awesome shop also has some fun pirate-y goods as well.