Ways to make money for my stable?

The stable I ride at doesn't have a lot of money. The stalls need repairs, they need new halters and leads, and they basically need help! They do a lot of lessons and have a handful of boarders, but my trainer, who owns the barn, is so generous, and does a lot of discount fees and such. They also host the local University Equestrian Team and there is a fee for them, but many of the team, seeing as they are broke college students, don't pay. My trainer is SO generous, as I already said, and lets it all slide. I am wondering about ways I could help my barn make money? I don't want my precious barn to shut down!