I'm currently using this code so far :

//Change renderer's material each changeInterval
// seconds from the material array defined in the inspector.
var materials : Material[]; 
var changeInterval = 0.33; 
function Update () { 
if (materials.Length == 0) // do nothing if no materials
return; 
// material index 
var index : int = Time.time / changeInterval; 
// take a modulo with materials count so that animation repeats 
index = index % materials.Length; 
// assign it to the renderer
renderer.sharedMaterial = materials[index]; 
}

( Found from Unity Script Reference Help )

and it's working for switching the materials on my plane by a timer. I would like to know if there is a way to make this better by making the materials switch with a button such as a Mouse click or just a button press. Even better would be to figure out a way to click on a made button in the game for the "next material" button.

The furthest I figure is somehow making a counter.

Please help!