CC has 2 types of finishes now for the engraved series: Traditional and Toasted.
If you examine the 4th picture down, there are 4 keycaps lined up. The left 2 are "traditional." That is to say, they are engraved and filled in, giving it an embossed texture. The right 2 are "toasted." I believe it's the same method initially, then it's somehow toasted to give it a nice, flush design with a smooth finish. Very impressive!
And last but not least, the Green Skull is named "Mr. Friday," probably for obvious reasons =)