If you were not so lucky to have a harddrive in your Amiga 600 or 1200 you were met with an insert disk animation when booting.
This app lets you display the original animation as a live wallpaper.
After installation, go to wallpaper settings and choose "Amiga Insert Disk".
UPDATE: Samsung have recently removed the possibility to set Live Wallpapers. Solution: Install Google's "Wallpapers" app from Play Store.
The app is written with energy efficiency in mind.