The Yellow JS (not sure about the ES6 one) logo was make by Chris Williams for the community and he has put up a repository for the same : <a href="https://github.com/voodootikigod/logo.js" rel="nofollow">https://github.com/voodootikigod/logo.js</a><p>As for the legal rights, Quoting: "We are releasing this under a MIT license so you can print it on anything, use it anywhere, and never have to worry about royalties, licenses, and other such things."