I'm currently working on a book based cosplay myself. Duke Mardus from Lynn Flewelling's Nightrunner
series. It turns out she'll be at the con I'm going to no less! I asked her about her thoughts on cosplay on her LJ and she responded enthusiastically. It'll also be a first for her. So yeah, definetely NO pressure whatsoever >.> It's pretty extensive and all. Amor and a helm o'doom, black mideval outfit, the whole deal. I hope it'll turn out good.
I also have another cosplay from the series, and surprisingly enough it was a closet cosplay. And not a cheapo looking on either, so at least I have something to fall back on if Mardus isn't done.
Other book cosplays I'm going to do are:
Cuthbert Allgood- from Stephen King's Dark Tower
Birigette or Nynaeve- Robert Jordan's Wheel of Time
series. (I may also be helping out my friend with a Mat cosplay as well.
Violet Baudelaire- Lemony Snicket's A Series of Unfortunate Events
(I know there's a movie but it'll be from the book designs.)