What if you did a horse and rider, except backwards. So you would be the horse and the horse would be the rider. You could rent a horse costume from a local costume store and you could put a helmet on the horse. You could also put a sign on the tail that says revenge is so sweet. (because the "horse" is making the "rider" do all the work)
For halloween I am going to be the grim reaper, and my horse a skeleton!!!! Im going to use white (safe) paint and paint a horse skeleton on her, lol. And I will just, you know, get a grim reaper costume! Lol. I thought it was a good idea, and easy on the budget!