In Final Fantasy 14, there's this twink catboy character who gets partially turned into crystal. We see his whole arm crystal, and some sticking out of his collar on the side of his neck. We never see him shirtless and we don't get too many details
I like to imagine that the crystal covers a large part of his torso, that you can see his bones and guts through it, and that I can watch my cock moving inside him when I fuck him.
That's been instant boner material for the last few years.