I make things. Some of them are hardware, some of them are software, some are both. I do leatherworking, woodworking, 3dprinting, sewing, and every other hobby I can get my hands on. I pay for all this by programming for my day job.
I made some flip flops out of leather for my mother's birthday! I'm working on making a couple more pairs in different colors and tooling to hone my skills.