This app was mentioned in 2 comments, with an average of 2.50 upvotes
Hi! We've just published a free Android app that shows great beach views on your TV!
You can pick from a tropical beach or a beach view at sunset.
The live backgrounds are not streamed from the internet and so, you can keep the live backgrounds running for hours without wasting your network bandwidth.
Google Play: https://play.google.com/store/apps/details?id=com.dunitiapps.cast.beach
The CC1 has 512 MB of Micron DDR3L RAM and 2 GB of flash storage
The CC2 512 MB of Samsung DDR3L RAM and 256 MB of flash storage.
Actually there is an app which says it buffers a full video scene of a beach on the chromecast, I am not sure where it does that! - https://play.google.com/store/apps/details?id=com.dunitiapps.cast.beach
I was wrong btw, you can change the rate of the backgrounds (1/2 speed etc)