Colors can be implicitly converted to and from Vector4.

	// Convert a white color to a vector4
	var aVector4 : Vector4 = Color.white;

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public Vector4 aVector4 = Color.white;
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public aVector4 as Vector4 = Color.white