I think these really work when done right. To me, that means the softer the better, the more serene the better, and the subtlest of tones and landscapes.
Not sure they work as well in kids' rooms, or kitchens, or anywhere else. Maybe because it's great to think of being in a dream or being outside while dining? Gives you something to look at in a larger room? In any event, hard to argue that these aren't lovely! I think the last one may even be my favorite.