I would really love color correction for the browser content area to be (ab)used to fix this. Everything else is themeable, but websites in their glorious variety can't really handle less radical forms of restyling.

Even with http://userstyles.org/ ?

That breaks when sites use images that match their background. You get a lot of white squares in random places.

This is one thing that Sublime 2 gets wrong

Is this what you are looking for?

https://github.com/buymeasoda/soda-theme

I'd tried that and it totally messed up the chrome because it could load the required images. But this was on Windows. Perhaps I'll try again.

You must have put the files on the wrong place. Works fine for me on Windows. This is my path:

C:\Users\swah\AppData\Roaming\Sublime Text 2\Packages\Theme - Soda

I'll try again. I just used the Package Manager

Are you referring to the sidebar? You can apply colours to that as well, it's just that the built in themes dont have them defined yet for some reason. At least the default one doesn't anyway.