One subject matter that I've explored again and again with a digital camera is the sea and sky. None have been successful enough for me to try venture forth using a large format camera with either colour or black and white film. There's been one exception.
It's frustrating, given that Hiroshi Sugimoto does such a good job of the sea and its horizon, and I spend a lot of time by the ocean and so I am familar with its different atmospherics. Maybe I need to experiment with longer exposures to soften the horizon line and smooth out the action of the waves.