Plugins

(function ($) {
    $.fn.greenify = function() {
        this.css("color", "green");
        this.addClass("greenified");
    };
})(jQuery)l

$("a").greenify();

Chaining

$('div.container')
    .css('background-color', 'red')
    .width(100)
    .height(150)
    .addClass('awesome-container');