You shouldn't request a light theme. That would take too much time from Jon, that could be invested on more useful and productive things. You should request a more theming possibilities! For example, here is my design: http://a.yfrog.com/img616/6518/1bn.png I'll release it as soon as SublimeText will allow me to finish it. We are almost there. Just a few more variables in .sublime-theme JSON.
Yes, we just need more possibilities. I too started to create a milky theme for OSX (basically the original one but 50% brighter) but cannot finish it due to lacking docs/knowledge and variables.
I like these themes https://github.com/buymeasoda/soda-theme/