WordPress users: customising your registration page

Morning all,

I’ve seen a few WordPress sites around the internet rececntly that have integrated their registration form into the design of their site. (Check out http://www.bingoport.co.uk/wp-register.php for an example of what I mean)

The default registration page is the WordPress blue box (http://www.theshortstack.co.uk/wp-register.php), but I was wondering whether someone could tell me (or give me a link to some information) relating to how I can customise this page, or ideally turn into another ‘page’ of my blog like BingoPort have done.

Thanks alot