Script for randomly changing MAC addreses on boot for OSX 10.8 while keeping a custom OUI.
Move com.rasebo.changemac.plist to /Library/LaunchDaemons and change the owner to root:wheel. Run launchctl load -w /Library/LaunchDaemons/com.rasebo.changemac.plist && launchctl start com.rasebo.changemac
Create /usr/local/scripts and move mac_change.sh into that folder. Edit the variables in mac_change.sh to match your system.