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. A combination of tea and a metal object in vinegar will produce a black stain.
How to Paint Cabinets or Furniture... using liquid sandpaper.... - cuts out the sanding step. From Better Homes and Gardens
Furniture Refresher To remove musty smells from old furniture, fill plastic containers with white vinegar; seal, and punch holes in lids. Put one inside each drawer or cabinet overnight to absorb odors. For extreme cases, clean interiors with a vinegar-dampened cloth.
How To Fix Dents in Wooden Floors & Furniture (With an Iron!) Apartment Therapy…
How to remove dents from wood, including hardwood floors.
Getting Rid of Thrift Store Smell
How to age new wood with steel wool and apple cider vinegar