While we provide you a recommended icon for each page type you add to your app, you can further customize your page by choosing a different page from our page icon library.
To change the icon,
Open the page settings panel by click on the cog button on the current page
Click on the current icon in the center
Select the icon you want from the list
You will need to publish for the icon (and any changes) to appear on your app.
If you'd like to see more icons, let us know what we're missing!