Readable DevTools theme. Enable DevTools experiments in about:flags, then open DevTools and toggle "Allow UI themes" experiment.
This is a great and simple Chrome Dev Tools theme using the new API (Chrome 33+).
It is an adaptation of the original Readable Chrome Dev Tools theme found here:
But I could not find an extension to use with the newer versions of Chrome.
Also thanks to Paul Irish https://github.com/paulirish/sample-devtools-theme-extension