Default run apps as full-screen widgets?

For example, consider Google Keep. I want to run it as a homescreen page, or alternatively, force the widget to use the full screen (except for the status bar). I would like to do this with all the apps I use regularly, or at a bare minimum, one of them. There's a mod for iOS that does this in the same way Google Now does, where it turns the left-most homescreen page into an app.

Is there a mod or something to accomplish this?