Hey, there, today I am going to show you how to get ChromeOS and Install it in VirtualBox.  You are going to need a few things

First, create a bunk Gmail account you wont care about or use, just incase this has some code in it that will steal Gmail info.  I have scanned this file with MBAM, SAS, MSSE, AVG, and Avast, just  to be safe.  Next,you are going to need ChromeOS: note that it is a torrent download, you will need software like Utorrent in order to download it:

Once It is downloaded, Extract it.  Mac OS X should be able to do it automatically, but for Windows you will need 7-zip, a free extracting utility. Right-click the downloaded file, and extract wherever you want to extract it too with 7-zip. Once It is extracted, fire up Virtualbox [after you get it from here]

Create a new machine, and hit next.  Name it whatever you want to name it, and change the OS Type to Linux[leave the version Ubuntu].  Give it as much RAM as you want, and Hit Next.  Use an existing hard disk, hit the folder icon next to the name.  Hit add, and navigate to where you extracted ChromeOS to, and hit select. Hit next, then finish, and you now have Google ChromeOS at your fingertips to use whenever you want to!!