I often have to do presentations or showcase a site or an application. I find taking pictures or showcasing the application can help many people get a sense of what I am talking about. I recently discovered a great tool to take a screenshot of your app or website using multiple devices. http://placeit.breezi.com/ has Mobile devices, tablets, pc’s and other great images to showcase your app.
These can be great tools to showcase your responsive design or just how your app my look while in use. The site allows you to upload an image or just grab a screen shot from a url.
Take a look at a few of my blog. These action shots look very nice and showcase the responsive design.