Screensaver
Fake lock screens. Pick one, click anywhere (or pressF) to go fullscreen, and anyone walking past sees a locked machine. Esc exits. The clock is live and the screen stays awake.
Windows 11
Bloom-style blue wallpaper, centered clock, wifi + battery tray.
macOS
Sonoma-style gradient, big bold clock, Touch ID user card.
Ubuntu
GNOME shield screen in aubergine with an orange glow.
Arch
Bare tty1 login prompt with a blinking cursor. Very btw.
Kali
Dark blue lock screen with a 24-hour clock and kali@kali login.