Dust City by Robert Paul Weston
Both those covers make you go "WOW." The first one for its menacing and mysterious look -- that fog wrapping around the title is beautiful, and those eyes must be the best face I've seen on a cover. (It's shiny in real life, too!) The second one for its style -- the quirkiness of the illustration, plus the awesome tagline placing. And did you notice the trees (so important) and the little city there?
Delirium by Lauren Oliver
Excuse me while I sob.
WHAT happened to the ARC cover, that first one there? We go from "Interesting, a girl in a simple dress (for once!) with a lovely background" to "Okaaay, bright turquoise...?" to "Whoopdeedoo. Another close-up of a girl face". Yaaaaaay.
Silver Phoenix by Cindy Pon
The first one, the hardcover, is most definitely evocative of the novel's tone and lush atmosphere. The second one may turn off less foreigner-phobic non-Asians. And the third is neither -- it's the Indonesian edition. :D Isn't it lovely?