Martha Hat?

So, I geeked it up for the new year and watched most of season three of the new Doctor Who with a friend over the past couple days. (Don't worry, I was knitting while we watched it.) However, now I desperately want Martha's hat from Human Nature/Family of Blood (because I didn't want it enough last summer when it aired on TV). My Google-fu seems to be failing me because I can't seem to find a pattern for it on the web. It may be that a pattern for exactly this hat doesn't exist (although knowing the Who fandom, I doubt this greatly), but I figure there is probably a pattern out there that is fairly similar.
( Pictures of Martha's Hat Under the Cut )

I realise that these aren't necessarily the best picture in the world of a hat (like, I have no view of the top of it), but finding any screen caps was hard (and I'd like to thank lifeonmartha for aiding me). Help? Anyone?