Greasy Fork is available in English.
Pieces periodically get a new theme on chess.com
// ==UserScript==
// @name TrollChess
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Pieces periodically get a new theme on chess.com
// @author SimpleVar
// @match https://www.chess.com/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=chess.com
// @license MIT
// @grant none
// ==/UserScript==
(() => {
const THEMES = ['neo','wood','8_bit','alpha','bases','book','cases','classic','club','condal','game_room','icy_sea',
'lolz','marble','maya','modern','nature','neo','neo_wood','ocean','space','tournament','vintage','wood'];
bazinga()
function randItem(arr) { return arr[(Math.random() * arr.length)|0] }
function bazinga() {
const pieces = document.querySelectorAll('.piece')
const p = randItem(pieces)
if (!p) { setTimeout(bazinga, 200); return }
p.style.backgroundImage = "url('https://images.chesscomfiles.com/chess-themes/pieces/"+
randItem(THEMES)+"/150/"+[...p.classList].find(w => w.length === 2)+".png')"
setTimeout(bazinga, ((Math.random() * Math.random()) * 1000 + 50)|0)
}
})()