For applying Hoof oil / Hoof flex on your horses hooves, you'll find a small sponge works just as well as an oil brush.
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.
Old Horse Fly Masks make great wound covers and keep the flies off your horses' legs while still allowing the air to circulate to heal the wound.