Here are two more Dark Field images and a shot of my setup that I used for both these images.
And for anyone who wants to try this, here is my setup that was used to create all of my dark field shots...
The setup sits on a piece of black Plexiglas. I have a translucent piece of Plexiglas that i shine two gelled studio lights at (i.e. back lighting). The piece of black velvet extends just past what I can see in my camera's viewfinder. The light catches the edges of the glass, which that camera captures.