Andy Hughes,
I am not certain where you live and if you can visit examples first hand but the first example where I have done it is a green side bunker where the fairway is up to the sand on the 5th hole at Laurel Links on Long Island. Probably the best example will be on a course I have under construction where fairway will meet sand on the majority of bunkers, although the course will only have about 37 bunkers. I have a picture of the 5th at LL and if I have time to figure out how to post a picture I will do. It makes persent sense from a strategic sense, and if you research the maintenance ramifications, debate it among the experts, you'll never do anything like this, I mean you ask a few people and you get all these reason why it might not work, what the problems could be, and so on, and really you just have to do these things for yourself and see how it plays out, I mean I hate to say it publically but certain elements that are introduced on a client's course are experimental because most people do not fully understand the ramifications of things like this either because it is rarely done or they have no clue what you are talking about. If you believe in it and give it reasonable thought, maybe consult a few trusted people, then you must act, because if you depend on members, clients, superintendents or committees to give you direction you will never grow your design ideas, you'll just fall into a comfortable, conservative rut, you might as well ask the three blind mice when it is safe to cross the street.