I make bracelets, collars, reins, leadropes, and leashes out of paracord. I make enough money to pay for horse camp and my local shows.
Your own business like horse shoe items?
You could make headstalls with a really sheep material. My friend makes those and she made a lot of money, you could also make halters etc....
I clip ponies in the winter and offer to hep out with others in the surrounding area . For example: feeding, change of boots, change of rugs and so on..
Maybe selling chocolate boxes? You buy a box and make profits from it