highlight-escape-sequences

https://github.com/dgutov/highlight-escape-sequences.git

git clone 'git://github.com/dgutov/highlight-escape-sequences.git'
7

Highlight Escape Sequences

screenie

Look inside for instructions.

The theme on the screenshot is espresso, with the following addition:

(put 'font-lock-regexp-grouping-backslash 'face-alias 'font-lock-builtin-face)