After some Katy Perry love for Chromebooks, here is another theme I found that you can run on your Chrome OS.
Central Wave is a free, simple theme for the Chrome OS Chromebooks. It was specially designed to run on the Chrome OS netbooks by the only school-operated radio station in Forsyth County.
Google recently announced the all new, updated Chrome OS and Chromebooks which would just run Chrome OS on them. Basically, it is just the Google Chrome browser running on a netbook/notebook.
You can download Chrome themes for free from the Chrome Web Store, but there are some themes tailored specially for the Chrome OS on Chromebooks.