Round stable with horse boxes and a central storage and work room. Would allow large paddocks out of the stalls and still have central hub for barn activities. I would dub this barn "The horses of the round table/stable"
I appreciate the small pens, as an addition to large pastures, of course. Maybe you need to keep a horse in while you wait on the vet or a buyer. You can stash him there without typing up an easily agitated horse.