I've got a better idea.
Here's a white cabinet door, and some white wooden letters from a craft store. In about 10 minutes, I dry-brushed the cabinet door with some General Finishes Milk Paint and Van Dyke Brown glaze, until it looked like driftwood.
Once all the paint dried (in about 30 minutes), I scraped some Modern Masters Metal Effects iron paint on the letters. Once it dried, I painted some rust patina on it (also Modern Masters Metal Effects). The next day, it looked rusty!
In the meantime, I found some random knobs (all shiny silver) that needed some character. So with Metal Effects copper and iron paints, some blue patina and rust patina, I transformed them as well.
Put them all together...