Is there such thing as Horse Paint?

Alright so I own a brown gelding quarter horse. We are showing in our county fair this yr andtere is one part with a costume contest. We are going as a cop and robber.I will be th cop and I am dressing my horse ( Frosty ) as the robber...We are going to put a mug shot around his neck and black and white stripes on him. Well I was wondering if there is some horse safe spray paint i can put on him instead of sewing a costume?? If so please tell me what is called and where you can get it and also what colors they come in :) Thanks !!