A lone lightning bolt strikes the ground beneath an isolated super cell thunderstorm at sunset. The flying saucer-shaped severe cell produced baseball-sized hailstones. Photo by professional storm chaser Jim Reed.
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.