XScreenSaver

I start xscreensaver from my i3 config, and have a binding for locking the screen:

exec --no-startup-id xscreensaver -nosplash
bindsym $mod+Mod1+l exec "xscreensaver-command -lock"

I did some appearance modifications for xscreensaver as well. They're all via .Xresources. See Xresources