You can take a look at the covers of Seiyuu GPX magazine.. 

  http://www.win.ne.jp/~doi/seiyuu/images/books/s-gpx/

(not all links are good, as I haven't summarized all of them yet)

My favorites are 7, 9, 17.
--
Hitoshi Doi                                               Toshi Nibunnoichi
half a UFO catcher doll, half a cel          801 tactical training squadron
http://www.win.ne.jp/~doi/                                    doi@win.ne.jp