Here's an example shot between halves at a lacrosse game a week or so ago. The stick and ball belong the daughter of friends of ours who was sitting on the sideline watching the game. The composition, late afternoon lighting and contrast of the yellow head and ball with the green grass and white line were an afterthought. It just worked and seemed natural without any real planning or setup, it was just there asking to be photographed. The stick was literally laying there in front of me on the ground. I think I asked our friends' daughter to move it a foot or so on top of the white line. That was it.
And of course this would have been one of those 'that would be a cool photo if I had my camera' moments. But, guess what? I had a camera. Ha!