What is your money-making side project outside programming? 2025 edition

I'm getting to the "semi-pro" level in photography; two years I was getting bored w/ photography then looked out the window of my office to the sports center and then I started going to games. Now I'm pretty good

https://bsky.app/profile/up-8.bsky.social/post/3lewyzub3pc2s

and my pics are better than the pics other people are selling to local papers. I also know there are parents who really want pictures of their kids performing. In either case it's a marketing problem, the first case is a matter of "just do it", the second is a matter of figuring out how to reach those people. I'd love to be able to write off a $5k camera off my taxes.