Having shot hundreds of team photo's I can tell you it's virtually impossible not to do boring! So your use of the Jungle Gym is inspired - nice work! But now I'll tell you how I believe it could have been stronger. By getting up higher (a ladder provided by the school's maintenance staff) you can a) reduce the problem of the faces towards the back being hidden by those in front, and b) if it's high enough, put all the faces more nearly into the same plane, reducing the apparent size difference.

But, like I said, Nice Job!