I ganked this from Nathan's blog, but it's just so cool. It's a two-minute sped-up look at the design process behind the cover for Gail Carriger's Blameless, the third in her Parasol Protectorate series.
I liked Soulless, the first book in the series. One of the main reasons I bought it initially was because of its cover:
The cover for the second book (which I haven't read...yet) is also cool:
So anyway, here's the book trailer for Blameless: