Custom theme including planning, implementation, compatibility resolution with other needed tools, code that is light, clean.
By now, millions of designers know the CSS ZenGarden and its Wordpress Theme method - standardized markup, different styles applied. Working on a Zen Garden design and being accepted is a great feat and reward for the hard work.
Competitions are a great way to promote your website! Check out this upcoming contest for designing Wordpress themes, March of 2006.
John Oxton's Beautiful Wordpress theme at joshuaink.com