What I'm looking for, is the ability to completely customize the Username/Password fields in Drupal 6. I found an example of the sort of customization I'm looking for on the site www.twoshirts.org, from the www.MustardSeedMedia.com portfolio.

So far, my search has turned up instructions for theming for the Search here:

http://www.codegobbler.com/customizing-search-box-...

But I can't find equivalent instructions for the Login.