Ooh! I've always loved the figurative language Sanderson uses. But sorry, most of these are going to be from Oathbringer because it's the only book I own. So, Oathbringer spoilers ahead!
Oathbringer chapter 1
Oathbringer chapter 12
Oathbringer, chapter 16
Oathbringer chapter 63
And this one isn't really of special notice, but I still find it amusing with its in-world reference. From Oathbringer chapter 65
I know there are a lot of odd metaphors in Wax and Wayne whenever Wayne has a POV, but in the only ones that really come to mind are during Shadows of Self when he describes the "tyrant" of the university.
So that's all for now. I might add more later if I find any ?