I am putting together a beamer presentation in which I alternate between a running example and the theory behind the example. How can I get this to reflect in the slides? Ideally I'd like something like "Theory" to appear on theory slides and "Example" on example slides. Section headings won't really do the trick because of the alternation. If that's not possible (or even if it is) is there a way to get Lyx to change the background color of a slide or some other cue to let the audience know?