DevReactions for Ruby/Sinatra
This little Ruby/Sinatra app fetches those feeds and displays the GIFs in a random order in fullscreen without any clutter.
bundle install rake rackup
Fire up your browser and go to: http://localhost:9292. If you're using Google Chrome, hit cmd+Shift+F for full-screen mode.
If you're on OS X, you might like Websaver, which let's you display a website (e.g. this app) as a screen-saver.