Horse breeds: The falabella ponies are the smallest know to man, reaching to only about 3 ft. Tall when fully grown! Pony of the Americans is a awesome horse for kids. They have a perfect slope in their backs so it's easy to stay on, even bareback.
Nice idea to keep your horse busy - particulary during boring stall times. Birchbark is also a healthy support for change of coat. I don't use stalls, but could be fun for the pasture/run in shelter. Or if a horse needs to be in the stall for laminitis