LDR_FaviconByGoogle.user.js

// ==UserScript==
// @name    LDR_FaviconByGoogle
// @include http://reader.livedoor.com/reader/*
// @version 1.0.0
// ==/UserScript==
(function(){
	with(unsafeWindow) {
		register_hook("AFTER_SUBS_LOAD", function() {
			var treeitems = document.getElementsByClassName('treeitem');
			Array.prototype.forEach.call(treeitems, function(treeitem) {
				var subid = treeitem.getAttribute('subscribe_id');
				var subitem = subs_item(subid);
				var iconurl = 'http://www.google.com/s2/favicons?domain_url=' + subitem.link;
				subitem.icon = iconurl
				treeitem.style.backgroundImage = 'url(' + iconurl + ')';
			});
		});
	}
})();