I agree that some sites have a reason for wanting to keep the look of all pages in sync, I think it's fair to point out (because most people won't think of it),

I agree that some sites have a reason for wanting to keep the look of all pages in sync, I think it's fair to point out (because most people won't think of it), that this isn't really all that important for a basic blog. You don't really need all your posts to look identical. There are some things, like what url the home page links to, that need to be kept in sync everywhere, but that isn't hard to do.