Load Textrue with WWW

[WWW.texture] : http://docs.unity3d.com/ScriptReference/WWW-texture.html

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public string url = "http://images.earthcam.com/ec_metros/ourcams/fridays.jpg";
    IEnumerator Start() {
        WWW www = new WWW(url);
        yield return www;
        renderer.material.mainTexture = www.texture;
    }
}

[WWW.LoadImageIntoTexture] : http://docs.unity3d.com/ScriptReference/WWW.LoadImageIntoTexture.html

	// Continuously get the latest webcam shot from outside "Friday's" in Times Square
	// and DXT compress them at runtime
	var url = "http://images.earthcam.com/ec_metros/ourcams/fridays.jpg";
	function Start () {
		// Create a texture in DXT1 format
		renderer.material.mainTexture = new Texture2D(4, 4, TextureFormat.DXT1, false);
		while(true) {
			// Start a download of the given URL
			var www = new WWW(url);
			// wait until the download is done
			yield www;
			// assign the downloaded image to the main texture of the object
			www.LoadImageIntoTexture(renderer.material.mainTexture);
		}
	}