First, I sanded the seat just a little (black paint can be tricky because sanding can actually make it look gray, so approach with a light hand). I chose my stencil and grabbed some spare gray paint from my garage. I just kind of dabbed on the paint and worked with it till it looked about right.
I like things to look worn, not crafted, so I rubbed those smudgy edges down a little with sand paper again.
Now every time I sit down to my computer, I get to sit here. And it's only going to get better with age.