Place your painted furniture on a drop cloth in a clean, well-ventilated area.
Run sandpaper along the edges of the furniture in random areas to show the wood underneath. You can also sand in other areas that would have worn over time, such as the top and legs. Use a clean tack cloth to wipe away the sawdust.
Use a drill with a small drill bit to make holes in the furniture to give the look of worm holes. Wipe away the sawdust.
Hit the furniture with a heavy chain in areas to make dents and scratches.
Wipe the entire furniture piece with a tack cloth to remove any dirt or debris.
Shake the stain well to mix it together. Dip a rag into the stain and run it along the areas you sanded. Dab the stain into the holes and dents you made.
Wipe away the excess stain with a clean rag. Let the stain dry completely.
Apply a coat of varnish to the entire piece of furniture with a foam paintbrush to protect the finish.