This is the before picture - well sort of, I got so excited about this project that I forgot to take a picture of what it looked like, but this cabinet door looked exactly like the one I used for the towel rack, just a little bit different shape.
I sanded it.
Painted it and then sanded the edges of the cabinet door.
Added the knobs for the towels to hang on. I did three, since I have three kids and they will each have a place for their towel.