I can tell you, having lived in Houston for five years now (yes, I know I'm not a native Texan, but I play with them regularly), that most of the people around here are disgustingly un-regional.
I was greatly disappointed to find zero cattle, zero bleached cow skulls, zero desert, and zero cowboys. Apparently, as a Houstonian told me, "Nah, that's WEST Texas you're thinking of." They don't even really have accents on this side -- although they make fun of my mixed up one all the time ("Boul? You mean the one with horns or the one you put soup in?" "Fer? Isn't that what animals wear?").
I have a friend who is originally from Louisiana and who thinks of himself as Cajun. From hearing him talk, the image I've gotten is of a culture similar to that of my Italian in-laws -- the traditions live on in what your mom serves when you come home to visit and at holidays, and the rest of the time, they aren't really an issue.
Of course, I only know a couple of people who consider themselves Cajun, so I can't speak for all of them, or even most of them.