I am looking for a way to force "emacs -nw" to use the same background color that the terminal uses. (just like vim does). By default, every emacs theme has its own default background color. Whiteboard mode has white that is not the same white as my terminal.
It seems that setting the background color of the default font to an undefined value turns off any customization. This feels like a hack, and there might be a better way to do this, but this worked for me:
;; init.el (set-face-background 'default "undefined")
Of course, if "undefined" will ever be defined (haha) in the color palette, this will break.