Apparently there is a hidden jellybean screen saver in Android 4.2. This article here describes how you can get it by repeatedly tapping the Android version number in Settings, About.
It did nothing on my Google Nexus 7 running Android 4.2 though. I pressed it 20 times or more, but got nowhere. This may be specific to mobile phones because there's a comment on the above article from someone with a Google Nexus 10 that said they couldn't access it either.
I thought I would try tapping the build number instead, thinking that it may be different on my Nexus 7 and after a few taps it started to display a countdown message reporting that I was soon to become a developer. After a few more taps and I was a full blown Android developer.
The Developer menu appears in Settings and it provides access to a number of functions. To be honest, few of them are useful if you are not an Android developer, but it's interesting anyway. The Stay Awake option might be useful if you want your device to stay on and not blank the screen after a minute or two. There's an option to protect USB storage, and one to show CPU usage. The rest, well, I'll leave them for developers.
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