A tutorial about creating custom accessible & skeuomorphic checkboxes and radio buttons with jQuery and CSS.
Labelauty is a nice and lightweight jQuery plugin that gives beauty to checkboxes and radio buttons and allows custom labels for each status of (un)checked inputs.
Checkator is a jQuery-based replacement for radio and checkbox elements. It supports css styling, and affects the original radio or checkbox element directly, which is used as the data container.
checkBo is a lightweight jQuery plugin for custom checkbox and radio.