If you heat steel up the right temperature, you can get some cool colors. I've been on a bit of a bluing kick, that is, heating up screws and wheels and getting them to turn a magnificent color-for no other reason than it looks INCREDIBLE.

There are a few different methods to turning your steel blue, each with their own sets of pros and cons. Being an amateur at this, I've been giving them all a try to see which I prefer and so that I can further understand the process.