xscreensaver is safe to run with some settings that won't change Elementary OS look and feel: choose your screensaver and check he doesn't do so and save those settings.

Once done, you'll notice that you can't just add it on startup, it requires a script to run properly (otherwise it's window will popup on startup).

Note: I installed it because on my system, suddenly my machine wouldn't suspend anymore, requiring the need to install xscreensaver.


Applications > System Settings > Applications > Startup Tab > add > Type in custom command

and there type: xscreensaver -nosplash

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