Elk Creek has three courses. Two which are setup like hunting conditions with a lot of gimme targets. Those are for beginners or people more interested in high scores than increasing their shooting ability.
Their third course is setup with targets which can humble you at times. Small windows in the woods, high quartering targets with a cant to them, long distance targets or my favorite a rabbit target which is charging and is only in view for a very small time until it is so close you just have no chance to hit it.
Point is since Sporting Clays has no hard and fast target rules like Trap or Skeet the only limitations on targets are terrain and imagination. Clubs will change targets if you can make a suggestion that sounds interesting. That charging rabbit was a suggestion that people love to hate. New targets always add interest and clubs like keeping shooters interested.