For applying Hoof oil / Hoof flex on your horses hooves, you'll find a small sponge works just as well as an oil brush.
Concerned about your horses nutrition? You don't often see Vegetable Oil listed in equestrian diet books; but, when vegetable oil is added to your horse feel, it helps lubricate for their hooves and coat; and, also add calories to the diet for the hard keepers.
Looking for some Horse Stall Toys? Clean out a milk bottle well and fill with molasses for your favorite equine. Poke a few small holes in it and tie it to a tree or rafter and watch your horse spend hours licking the jug to get the molasses out.