クリック毎に色を切り替える。ついでにテキストへ文字を出力したり。

ColorChanger.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class ColorChanger : MonoBehaviour {

	private IEnumerator<Color> action;
	
	[SerializeField] private UnityEngine.UI.Text text;
	
	void Update () {
		if( Input.GetMouseButtonDown(0)){
			if( action == null ){ action = Actions(); }
			action.MoveNext();
		}
	}
	
	IEnumerator<Color> Actions(){
		
		// 色を塗るために使用するパラメータを取得する
		var renderer = GetComponent<Renderer>();
		MaterialPropertyBlock block = new MaterialPropertyBlock();
		
		while(true){
			// 赤く塗る
			block.SetColor("_Color", Color.red);
			renderer.SetPropertyBlock(block);
			transform.position = Vector3.right;
			text.text = "RED";
			yield return Color.red;
			
			// 青く塗る
			block.SetColor("_Color", Color.blue);
			renderer.SetPropertyBlock(block);
			transform.position = Vector3.right + Vector3.up;
			text.text = "BLUE";
			yield return Color.blue;

			// 緑に塗る
			block.SetColor("_Color", Color.green);
			renderer.SetPropertyBlock(block);
			transform.position = Vector3.up;
			text.text = "GREEN";
			yield return Color.green;

			// 白く塗る
			block.SetColor("_Color", Color.white);
			renderer.SetPropertyBlock(block);
			transform.position = Vector3.zero;
			text.text = "WHITE";
			yield return Color.white;
		}
	}	
}