I came up with two today, but the blue and gray scheme that I created is my favorite of the two! The "banner" I included in it is really just a placeholder for the banner space, because I think that a fitting banner for this particular theme would be an image of blue outlines of Lightning's face (a little darker than what's presented), which is similar to the placeholder image. Both the background and forum categories become darker further down, because I think it's a neat effect. I don't know whether it's actually possible to recreate, though.
Oh, and my schemes were made from screenshots of VB4's version of Classic, just because.