Greasy Fork is available in English.
replaces the any logo with one of your wish
// ==UserScript==
// @name LogoChanger v1.0.5
// @namespace Logo
// @author Maxy
// @description replaces the any logo with one of your wish
// @include http://baidu.com/*
// @include *.baidu.com/*
// @version 1.0.5
// @grant none
// ==/UserScript==
// saves all settings of all <img> tags in the tags variable/array
var tags = document.getElementsByTagName('img');
// goes through every entry in the tags array, so through every <img> tag
for (var i = 0; i < tags.length; i++) {
// replaces the searched image src with the one you want. This happens in ALL <img> tags with the searched src
tags[i].src = tags[i].src.replace('http://img.baidu.com/img/baike/logo-baike.png', 'https://farm4.staticflickr.com/3901/14767310726_7f804f1944_o.png');
tags[i].src = tags[i].src.replace('http://www.baidu.com/img/baidu_jgylogo3.gif?v=06534357.gif', 'https://farm4.staticflickr.com/3901/14767310726_7f804f1944_o.png');
}