So do this:
apt-get install xscreensaver xscreensaver-screensaver-bsod
This will install the amazing xscreensaver daemon and a crapton of extra awesome screensavers including the BSOD and XMatrix ones.
Run “xscreensaver-demo” to load the config dialog box and set your awesome screensavers!!
Then you can make a keyboard short-cut for Super+L that runs “xscreensaver-command -lock” and locks your computer and starts the screensaver!!! (basically what I did as I like Mod4+L (the windows key and L that are closest to each other) to be my shortcut just like in winblows!!