I actually picked one up recently that could be pretty awesome (and potentially slightly illegal) be a life coach. Tell people what is wrong with their life and how to fix it and make it better. My buddy has done this for a few years and makes a few hundred bucks a month on the side to help people improve their lives.
One interesting way to make money is to make a raffle at school. My friends and I have made this once and we earned enough money to make a travel. I was a tutor of students, but I didn't earn money for this.
One of my cousins videos himself playing COD, adds some commentary, and then sells his videos. From what he said, it sounds like he actually makes a decent amount playing video games.