This technique didn't work out very well for me. I think it needs some more experimentation. However, since I'm trying to get all these cards done and posted on time, I went ahead and used it.
I used Enchanted Evening reinker to watercolor my white panel. While wet, I sprinkled it with sea salt and let it dry. It needed a little something so I added black brads in the corners. Then I simply adhered it to an Enchanted Evening card base. Pretty simple card!
Stamps: Think Big Favorites #5 (Papertrey Ink)
Paper: White, Enchanted Evening (Papertrey Ink)
Ink: Tuxedo Black (Memento)
Misc: black brads (Making Memories