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Salesforce Mobile App Custom Icons
You can also customize the icon that is used in the Salesforce action bar and action menu for a canvas app. The action bar uses the custom icon set for the action that accesses the canvas app, not the custom icon that is associated with the connected app. You set the action icons by uploading a static resource file for your custom icon and then using this static resource as the icon for the global action. The static resource icon file should be in the PNG format, with a size of 120 pixels high by 120 pixels wide. See “Custom Icon Guidelines and Best Practices” in the Salesforce Mobile App Developer Guide for more guidelines on custom action icons.