a way to put design elements in your Unity scene so they disappear when you play.

DestroyOnAwake.cs

using UnityEngine;

// @kurtdekker - Attach this script to GameObjects you
// want to have in your scene for alignment and design,
// but you want to be destroyed during real gameplay.

public class DestroyOnAwake : MonoBehaviour
{
	void Awake()
	{
		// and you can comment this out and run and you will have
		// all your guides still in project at runtime!!
		Destroy(gameObject);
	}
}