Here's a quick video showing how to style up Chrome Dev Tools using the 'INSPECTORCEPTION' method.
The file you're going to want to edit / replace can be found here:
~/Library/Application Support/Google/Chrome/Default/User StyleSheets/Custom.css
You can download the one above and the v2 I've done here: https://github.com/simonowendesign/SO-Dark-Monokai-v2.
I'd also recommend checking out:
/devthemez.com (no longer online)
Edit: APR 12th, 2013
In the latest version on Chrome Canary, it looks like the images have changed, so setup https://github.com/simonowendesign/chrome-dev-tools-images to keep track of the images available.
Also added a
CHANGELOG.md file to the theme, to keep track of changes:
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