best way to show iphone purchased assets

I was wondering what the best way would be to show purchased assets for an iphone app. Right now when a person purchases an item it is stored as an assetbundle in their documents folder.

I want to display a png of each item they have purchased. I'm confused about how I would loop through all the asset bundles and get all the pngs and display them in the game. Can I use www in a for loop?

Something like this?

 function getAssetPngs(assetBundleName:String){
         var download : WWW;
     var url = "http://serveraddressgoeshere/"+assetBundleName;
 Debug.Log("url="+url);
     download = new WWW (url);
 yield download;
 currentAssetBundle = download.assetBundle;
     if (currentAssetBundle != null) {

 *****currentAssetBundle.somehow load png in bundle to texture2d?*******
         }
         }