I noticed a couple of issues in the applied patch (possibly due to a
transcription error on my part).  Namely
- I believe your default faces only work for white backgrounds
- I didn't notice a change in background for the code blocks
- it seems that the #+end_src line is fontified but the #+begin_src line
  is not

An image of my Emacs after applying the patch is available at:
http://i.imgur.com/2eu3z.png

Thanks for sharing, I hope this feedback is helpful.

Best -- Eric