Books with great characters and excellent dialogue. Any genre, but preferably something with a bit of humour.

I know that's a wide brief, but I'd love to hear of any book you think has interesting, colourful characters and well written dialogue. I'll read any genre, but even in serious books I like a bit of dry or dark humour.

I've found myself really struggling to find a book to get into and I'm sick of re-reading old favourites (American Gods, Jeeves & Wooster stories, Around the World in 80 Days, most recently), so any suggestions are very gratefully received!