If your appliances are, say, in the middle of your kitchen (mine were, at my last apartment), I can understand caring about the aesthetics of it. So you either get matching ones that are 'nice-looking', or you build a cupboard to put them in to hide them, or put them behind a curtain or something.
If they're in the basement or laundry closet, like in most houses? Seriously, you only see them when they're supposed to be functional. As long as they're functional, WHO CARES?