What comes to mind? Pigeons, prisoners, paupers. Corrupt bankers, grim aunts, specters, and pickpockets. Fierce satire and pointed parody. Abusive husbands and lonely orphans. (To be fair, I have not read most of his books. Perhaps there's perkier content in some of the others.)
Improbable as it seems, some version of Dickens World is due to open in Chatham (UK) in 2007.