EditorGUIUtility.Load

説明

ビルトインのリソースを読み込みます。

This function will look in Assets/Editor Default Resources/ + path for the resource. If not there, it will try the built-in editor resources by name.

using UnityEngine;
using UnityEditor;

public class LoadExample
{
    [MenuItem("Examples/Load Editor Texture Example")]
    static void loadExample()
    {
        Texture tex  = (Texture)EditorGUIUtility.Load("aboutwindow.mainheader");
        Debug.Log("Got: " + tex.name + " !");

        Renderer r = GameObject.Find("Cube").GetComponent<Renderer>();
        r.sharedMaterial.mainTexture = tex;
    }
}