Horse Brushes that do double duty? Nail a few old horse brushes (the bristly ones) to the sides of the stall so your horses can rub against them to get at those annoying itches.
For applying Hoof oil / Hoof flex on your horses hooves, you'll find a small sponge works just as well as an oil brush.
Are you shining bits, stirrups, and buckles? Toothpaste is wonderful for cleaning white stirrup pads and shining silver bits, stirrups, buckles, buttons on your tack. Toothpaste will make your horses gleam!