YNA Framework - Create custom Sprite with no texture

RawSprite.cs

using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Yna;
using Yna.Display;

namespace Yna.Test
{
    public class RawSpriteState : Yna.YnState
    {
        Sprite background;
        Sprite player;

        public RawSpriteState() : base ()
        {

        }

        public override void Initialize()
        {
            base.Initialize();

            background = new Sprite(Vector2.Zero, "2d//green-world");
            player = new Sprite(new Rectangle(0, 0, 50, 50), Color.Azure);
            player.ForceInsideOutsideScreen = true;

            Add(background);
            Add(player);
        }

        public override void Update(GameTime gameTime)
        {
            base.Update(gameTime);

            if (YnG.Keys.Escape)
                YnG.Quit();

            if (YnG.Keys.Up)
                player.Y = player.Y - 1 * gameTime.ElapsedGameTime.Milliseconds;

            if (YnG.Keys.Down)
                player.Y = player.Y + 1 * gameTime.ElapsedGameTime.Milliseconds;

            if (YnG.Keys.Left)
                player.X = player.X - 1 * gameTime.ElapsedGameTime.Milliseconds; 

            if (YnG.Keys.Right)
                player.X = player.X + 1 * gameTime.ElapsedGameTime.Milliseconds; 
        }
    }
}