To further customize your app, you can also change the appearence of your icons for every page of your app.
You have two options to do so:
1. Change the icon of your App page from the Page Options settings, therefore customizing it for that app only
2. Change the icon of your App page from the Look & Feel section of your dashboard, which will change the default icon of the Theme you have chosen for your App.
Click on the Options button on the right of each App page from the Page Control Panel on your dashboard:
Click on the Icon tab from the left hand inner sidebar and set your preferences:
Click on the Look & Feel tab on the top from your dashboard:
Click on the Icons inner tab:
And set your preferences for all the icons you wish.
REMEMBER that changes you make here will be saved for any future use of that same App theme.