Our Seven Dwarfs has some really great crafty sign tutorials on her site. A couple weeks ago I saw one for a bathroom sign I just had to try.
This is my version of it.
First, I just took one of the melamine doors and distressed it a little. I sanded the edges, threw some rocks at it (great stress reliever) and hit it with a wire brush. Then I went over it with stain to darken the edges and give it an antique white look.