All natural (mostly) wood stains! A handful of pennies in vinegar 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.
Scott this would be a good stain for furniture for you it's all black! :-) -Ea sand, paint, sand distress a piece of furniture, rub stain into the sanded distressed areas, finish with spray can of shellac.
Stain recipe - 1 cup vinegar (Either white or apple. Apple produces a little more of a teal color rather than bright blue.) - cup hydrogen peroxide - 40 ish pennies (this number varies largely on the amount of tint you want to your vinegar.
Frame Spray Painting Tip: place the frame in a box, and spray one side of it with your choice of spray paint. Leave it in the sun to dry, and then flip it over and spray the other side. Hell, spray EVERYTHING in a box from now on.