Douglas Crockford’s Module pattern, but it starts (and finishes) as an object rather than a function. A publicly accessible object metamorphoses into an object with public methods and variables, and private methods and variables.

metamorphosis pattern .js

metamorphosis = {
  defaults : {
    thing : 4
  },
  init : function (options) {
    var
      the = this,
      o, // private object
      p; // public object

    o = {
      hidden : 'a private variable'
    };

    p = {
      v : 64,
      show : function () {
        console.log('get: defaults.thing: ' + the.defaults.thing);
	console.log('get: private var: ' + o.hidden);
      },
      get : function () {
        return o.hidden;
      },
      set : function (arg) {
        o.hidden = arg;
      },
      make : function () {
        var r = {};
        return r;
      }
    };

    metamorphosis = p;
  }
};

metamorphosis.init(); // one could pass in an argument and extend or modify defaults
metamorphosis.show(); // defaults.thing and o.hidden still exist, but as private variables

console.log(metamorphosis.v); // 64
console.log(metamorphosis.defaults.thing); // will fail, as defaults are now private