private void Form1_Load(object sender, EventArgs e)
    {
        Height = 500;
        Width  = 500;

        MyPanel myPanel = new MyPanel();

        myPanel.BackColor   = Color.White;
        myPanel.BorderStyle = BorderStyle.FixedSingle;
        myPanel.Height      = Height - 50;
        myPanel.Width       = 200;
        myPanel.Top         = 5;
        myPanel.Left        = 5;
        Controls.Add(myPanel);

        var icon1 = Image.FromFile(@"path/to/file");      //Load the image FIRST

        MyPanel.Tile tile = new MyPanel.Tile(icon1);      //Pass it into the constructor
        tile.BackColor = Color.PowderBlue;
        myPanel.AddTile(tile);

        var icon2 = Image.FromFile(@"path/to/file");      //Again, image first

        MyPanel.Tile tile2 = new MyPanel.Tile(icon2);     //Then construct
        tile2.BackColor = Color.PeachPuff;
        myPanel.AddTile(tile2);
    }