I always think it's funny how each person goes about finding a new book. I rarely read the summary text on the back or inside flap. I pretty much just open to the first page and start reading. If I don't want to stop, then I don't, but if I do, then that's it. I guess that means I'm drawn to unique and interesting voices, and just good writing in general.
I love the themes of good vs evil and large, epic journeys. I also love the whole conspiracy theme, especially ones where the conspiracy turns out to be fact. As long as it's exciting and keeps me desperate to keep reading, most themes are tempting.
I almost only read off of recommendations. There are so many books and so little time. That said, I love anything Southern Gothic. Themes of place, religion, sin, family, abound in Southern Gothic.
Themes of mystery and shadows, wonderment, and internal demons I really love. I'm a very curious person so I'm drawn to vagueness and dark (not horror) because there's just the need to see it. Wonderment I love, like YA Fantasy, with a child or young teen experiencing magic for the first time; this theme just really brightens everything up for me. With internal demons, anything internal really, draws you in to a different head-space and see humanity from a different angle.
psychological thrillers. I love reading and watching well played head games.
I love time travel stories. When I find something that I really like I can read it a number of times.
Love science fiction or a bit of romance.
I love sci fi and fantasy, so if there are any elements of that in a story, I'll pick it up instantly. I'm also a murder mystery fan, so it's not unusual for me to buy mass market paperbacks in bulk.
I love sci-fi and fantasy, especially magical realism and dystopian fiction! I'm also a sucker for slow-burn romances with gothic twists. And I love classics and modern takes on classics. Or adaptations of Greek myths (though I guess that isn't really a theme).
I love all those great short story writers--Alice Munro, William Trevor, Lorrie Moore, T.C. Boyle. And the list goes on. Since genre-blending is big now, I'm just starting to read sci-fi and fantasy.