iCheck plugin works with checkboxes and radio buttons like a constructor.
It wraps each input with a div, which you may customize yourself or use one of the available skins.
You may also place inside that div some HTML code or text using insert option.

For this HTML:

<label>
  <input type="checkbox" name="quux[1]" disabled>
  Foo
</label>

<label for="baz[1]">Bar</label>
<input type="radio" name="quux[2]" id="baz[1]" checked>

<label for="baz[2]">Bar</label>
<input type="radio" name="quux[2]" id="baz[2]">

With default options you'll get nearly this:

<label>
  <div class="icheckbox disabled"><input type="checkbox" name="quux[1]" disabled></div>
  Foo
</label>

<label for="baz[1]">Bar</label>
<div class="iradio checked"><input type="radio" name="quux[2]" id="baz[1]" checked></div>

<label for="baz[2]">Bar</label>
<div class="iradio"><input type="radio" name="quux[2]" id="baz[2]"></div>

By default, iCheck doesn't provide any CSS styles for wrapper divs (if you don't use skins).

Options

These options are default:

{
  // 'checkbox' or 'radio' to style only checkboxes or radio buttons, both by default
  handle: '',

  // base class added to customized checkboxes
  checkboxClass: 'icheckbox',

  // base class added to customized radio buttons
  radioClass: 'iradio',

  // class added on checked state (input.checked = true)
  checkedClass: 'checked',

    // if not empty, used instead of 'checkedClass' option (input type specific)
    checkedCheckboxClass: '',
    checkedRadioClass: '',

  // if not empty, added as class name on unchecked state (input.checked = false)
  uncheckedClass: '',

    // if not empty, used instead of 'uncheckedClass' option (input type specific)
    uncheckedCheckboxClass: '',
    uncheckedRadioClass: '',

  // class added on disabled state (input.disabled = true)
  disabledClass: 'disabled',

    // if not empty, used instead of 'disabledClass' option (input type specific)
    disabledCheckboxClass: '',
    disabledRadioClass: '',

  // if not empty, added as class name on enabled state (input.disabled = false)
  enabledClass: '',

    // if not empty, used instead of 'enabledClass' option (input type specific)
    enabledCheckboxClass: '',
    enabledRadioClass: '',

  // class added on hover state (pointer is moved onto an input)
  hoverClass: 'hover',

  // class added on focus state (input has gained focus)
  focusClass: 'focus',

  // class added on active state (mouse button is pressed on an input)
  activeClass: 'active',

  // adds hoverClass to customized input on label hover and labelHoverClass to label on input hover
  labelHover: true,

    // class added to label if labelHover set to true
    labelHoverClass: 'hover',

  // increase clickable area by given % (negative number to decrease)
  increaseArea: '',

  // true to set 'pointer' CSS cursor over enabled inputs and 'default' over disabled
  cursor: false,

  // set true to inherit original input's class name
  inheritClass: false,

  // if set to true, input's id is prefixed with 'iCheck-' and attached
  inheritID: false,

  // add HTML code or text inside customized input
  insert: ''
}

There's no need to copy and paste all of them, you can just mention the ones you need:

$('input').iCheck({
  labelHover: false,
  cursor: true
});

You can choose any class names and slyle them as you want.

Initialize

Just include jquery.icheck.js (or zepto.icheck.js) after jQuery v1.7+ (or Zepto).

iCheck supports any selectors, but handles only checkboxes and radio buttons:

// customize all inputs (will search for checkboxes and radio buttons)
$('input').iCheck();

// handle inputs only inside $('.block')
$('.block input').iCheck();

// handle only checkboxes inside $('.test')
$('.test input').iCheck({
  handle: 'checkbox'
});

// handle .vote class elements (will search inside the element, if it's not an input)
$('.vote').iCheck();

// you can also change options after inputs are customized
$('input.some').iCheck({
  // different options
});

Callbacks

iCheck provides plenty callbacks, which may be used to handle changes.

Callback name	When used
ifClicked	user clicked on a customized input or an assigned label
ifChanged	input's checked or disabled state is changed
ifChecked	input's state is changed to checked
ifUnchecked	checked state is removed
ifDisabled	input's state is changed to disabled
ifEnabled	disabled state is removed
ifCreated	input is just customized
ifDestroyed	customization is just removed

Use on() method to bind them:

$('input').on('ifChecked', function(event){
  alert(event.type + ' callback');
});

ifCreated callback should be binded before plugin init.

Methods

These methods can be used to make changes programmatically (any selectors can be used):

$('input').iCheck('check'); — change input's state to checked

$('input').iCheck('uncheck'); — remove checked state

$('input').iCheck('toggle'); — toggle checked state

$('input').iCheck('disable'); — change input's state to disabled

$('input').iCheck('enable'); — remove disabled state

$('input').iCheck('update'); — apply input changes, which were done outside the plugin

$('input').iCheck('destroy'); — remove all traces of iCheck

You may also specify some function, that will be executed on each method call:

$('input').iCheck('check', function(){
  alert('Well done, Sir');
});