creating a list of texture2d components

I am making a game and right now I want to create the splash screens. I have a total of two screens and what I want to do is create a public list comprising of Texture2D where the user specifies how many textures he/she wants to add and then draw them onto the screen using OnGUI method. My issue wis that when I GUI.DrawTexture and pass the list it gives me an error saying that argument 2 is wrong.

Here is what I have done so far:

public int _WaitTimeBetweenScreens; public List _Screen;

  private void OnGUI()

  {

      GUI.DrawTexture(_someRect, _Screen);

  }

Can anyone help me figure out how to get it to draw the texture correctly? Many thanks in advance!