I would never think of decorating with cat stuff as I find that tacky. But I am a cat lover and sometimes, if it's done tastefully, it is OK. I hope! If you can't tell it's for cats, then I think it's OK. Like here:
Or if you just have a cat in the room, does that count?
Or for a laugh, sometimes one small piece can fit in quite nicely:
But I would like to clarify that it still depends solely on you and how you feel about cat paraphernalia. I think it can have its place in your home... if you really want it to. Who couldn't love one of these awesome modern cat beds?