Some toned coins I found till now in that 9.2 kg of Lincoln Cents purchased days ago. Only a few coins are in very good shape, but I loved the collors in ALL them.
I'm not a fan of toned coins. However, I do have several lightly toned Morgans. I bought a 2012 Limited Edition Silver Proof Set that almost all of the coins in it are lightly toned. The ASE is nicely toned.
I've owned this type coin, a 1799 dollar, for many years, purchased from Karl Stephens many years back. The blue/grey toning, with hints of violet is very nice. 26.7 grams Additionally, this $20 gold double eagle of 1852, New Orleans mint, has acquired a subtly orange/green color since I purchased it about 30 years ago from a local dealer.
^ I love that 1799 dollar. For something much more modern: my birthyear cent is rather strikingly toned.