My camera's not so good, it's horrible at picking up toning, especially on copper coins. Still, here are the better examples of what I have:
Scuffs are on the plastic holding the coin, not the coin itself. The camera only picked it up a little, but most of the obverse is covered with striking metallic green toning.
In person, this nickel is even more pink, blue, and gold.
One almost never comes across toned Standing Liberty Quarters.
This is from a 1988 proof set where the Nickel, Quarter, and Half are all toned to an electric blue. In addition, the nickel has a ring of gold around the rim and, although it doesn't show in the picture, is starting to get pink areas.
None of these are particularly impressive but I thought I'd contribute.