Chrome OS isn't quite as bad as it used to be. If you've got an old computer lying around that could use a refresh, CloudReady lets you install Chromium OS (the open-source variant of Chrome OS) on most computers.
To use it, simply copy CloudReady to a USB stick and use it to install Chromium OS on an old machine. The company's site says that the installer should work on computers up to 8 years old. Anything older than that probably wouldn't meet the basic system requirements to run Chromium OS anyway.