Rod at top of half-moon with long puddled drapes
A little traditional, but the application to hang could be pretty cool/different
A little formal - But you could easily do a roman shade for the top half of the window (over the half-moon) and then have long panels on either side.
don't really love the pattern, but more of the "idea of the pattern" - very soft and subtle.
Same idea of building a rectangular valance to hide the half-moon window, this one just curves... don't know if I love it, but it could work with a simple roman shade.