MahApps - Change icons to a desired PNG format

I found a WPF project on the web very cool. It uses a framework called MahApps. In the Hamburger menu there are some icons that use images from a Mahapps package. I would like to know if there is a possibility that I can change the block and configure it so that I can report a png image instead of using one of the mahapps package. Would anyone know how?

using System;
using MahApps.Metro.IconPacks;

namespace MahAppsMetroHamburgerMenuNavigation.ViewModels
{
    internal class ShellViewModel : ViewModelBase
    {
        public ShellViewModel()
        {
            // Build the menus
            this.Menu.Add(new MenuItem() { Icon = new PackIconFontAwesome() { Kind = PackIconFontAwesomeKind.Bug }, Text = "Bugs", NavigationDestination = new Uri("Views/BugsPage.xaml", UriKind.RelativeOrAbsolute)});
            this.Menu.Add(new MenuItem() {Icon = new PackIconFontAwesome() {Kind = PackIconFontAwesomeKind.UserOutline}, Text = "User", NavigationDestination = new Uri("Views/UserPage.xaml", UriKind.RelativeOrAbsolute)});
            this.Menu.Add(new MenuItem() {Icon = new PackIconFontAwesome() {Kind = PackIconFontAwesomeKind.Coffee}, Text = "Break", NavigationDestination = new Uri("Views/BreakPage.xaml", UriKind.RelativeOrAbsolute)});
            this.Menu.Add(new MenuItem() {Icon = new PackIconFontAwesome() {Kind = PackIconFontAwesomeKind.FontAwesome}, Text = "Awesome", NavigationDestination = new Uri("Views/AwesomePage.xaml", UriKind.RelativeOrAbsolute)});

            this.OptionsMenu.Add(new MenuItem() {Icon = new PackIconFontAwesome() {Kind = PackIconFontAwesomeKind.Cogs}, Text = "Settings", NavigationDestination = new Uri("Views/SettingsPage.xaml", UriKind.RelativeOrAbsolute)});
            this.OptionsMenu.Add(new MenuItem() {Icon = new PackIconFontAwesome() {Kind = PackIconFontAwesomeKind.InfoCircle}, Text = "About", NavigationDestination = new Uri("Views/AboutPage.xaml", UriKind.RelativeOrAbsolute)});
        }
    }
}