Hello again,
Just to say that I add right now to App Builder a new Footer app sample:
This app sample show us how to implement a kind of app footer which include various icons to navigate between the app views. This app sample show us various things like how to use the Inline CSS app option to customize various app controls with different styles. Also we can learn how to use app functions and how to take care about what specific "target id" has been clicked into an HTML control. This app sample show us a possible footer for our apps, but we can create footer using various controls too: Containers, Buttons, Images, HTML, etc.
That sample is available right now: www.getappbuilder.com