Android 4.2 Jelly Bean introduced a neat feature called Daydreams, which are screensavers for your device while they are docked or charging.
I designed It Is Time, a simple and minimalist daydream which displays the current time in words. So basically instead of 11:52 you'll see "eleven fifty two".
Here's the Google Play link...
To enable go to Settings > Display > Daydream. Enable Daydreams and choose the app. You can access the Settings from the icon on right of the listing to tweak it to your liking.
Check out the project page while you're at it!