When I was in college, both as an undergraduate, and then graduate student, I had some experience with creating websites/webpages. I experimented with different colors for the background and the text......and, trust me when I say this, the best color scheme BY FAR is white background with black text!!! What I learned was that being able to read the text as easily as possible is what is really important & that a white background with black text makes that very easy. I also learned that, though it might look "cool", other color schemes really don't cut it!i do feel that the post space should be black and the letters white,contrary to white with black words.Just an opinion.
So, if we really want people to be able to read what is posted, and I believe that is our main objective, a white back ground with black text (as it is right now) is the only way to go! Thus, I would STRONGLY recommend that we not change a thing in that regard. Other things might look neat, but if it's hard to read, it defeats the purpose.
For the record, I found a black background rarely works well, and a black background with red or blue text and white background with yellow text are some of the worst schemes I've ever experimented with.