You can go in to Settings -> Accessibility and invert the colors, but maybe thats not what your looking for
As for white background in SMS app, i saw that there is an option within the SMS program to change to various backgrounds(there are some bright ones) when reading an SMS, but it doesn't seem to work for the background on the main window.
I'm also interested in a white theme. Developer of the theme called "Domination" in "Galaxy Note 3 Themes and Apps" section said he might make a white theme. Might be something worth waiting for.