   Help with Colors with Textures: XNA
  Each of a set of tiles in my game has a black texture tinted with a certain color.  Questions:1)  How can I adjust the level of tint/ make the texture's tint darker or lighter?2)  Why can I not set any of the properties of the Color class? Why are they all read only?   
  Well, when you use SpriteBatch.Draw(Texture, Position, Color), pass in a different color instead of Color.White.Colors are basically static, to change the values you need to create a new structure, which you can do with new Color(r, g, b);   