Composition with balls?

Sometimes, I don't quite know what to do with a photo. Take this one. I was attracted by the bunch of balls lying on the training field--the sportsmen and -women were probably gone for a break, or the trainer was preparing for the next bunch of kids coming. It was a funny picure, I thought, with the uniform green (artificial 'grass'), straight lines and the random composition of balls. But due to practical limitations (I had to take my pictures from the outside of the terrain, from the sidewalk in the street), I could not get a shot without the messy surroundings of the border of the field, stuff lying around, etc. And now I'm stuck for good ideas: how to maintain the feel of the area, and yet make it better than this messy snapshot? Cropping does not work well, I think, and that is the only trick I can think of. But I want to keep that one ball in the background, which gives some feeling of depth, or continuity that helps to make it authentic rather than a purpose-made composition. Wish I could go back, but the summer season is over around here, and anyway another time the trainer will not have had the same luck with his random throwing around of the balls.
If I succeed in making a better picture out of it, I'll let you know! Just remind me if I forget...