Vinegar works as a wood stain when you add a metal object in the mix and let it sit in a glass container for a week. A handful of pennies will produce a beautiful pale Caribbean blue stain. A wad of steel wool will give you a rich reddish hue.
Use Baking Soda and Vinegar to "quick weather wood" to look much like driftwood! Remove finish on wood with ratio of baking soda and water. Spray with vinegar and let sit minutes. Then scrub it off with a brush, rinse, dry, and stain or paint it.