mooFormElements is a MooTools port of Ryan Fait's work; a nice, unobtrusive way of creating custom styled form inputs.
Current only supports:
input[type=checkbox]input[type=radio]select:not([multiple])
Definitely alpha for now!
Make sure you're using MooTools 1.4 (may work on earlier versions, may not) - does not require any of Core.
Firstly, you need to define what your custom form inputs will look like, refer to example.htm, and give all inputs you'd like to target the 'styled' class.
Next, include mooFormElements.js (after MooTools, obviously).
Lastly, instantiate the mooFormElements class, either in a domready, or at the end of the page.