We will be beta testing a set of features that allows any Weebly user to customize their theme, and are looking for users who know a bit of HTML/CSS and would be willing to spend a little time to test out the new features, won't mind if things aren't 100% solid yet, and will be able to give us some thoughtful feedback.

In return, you'll be able to get access to these features before anyone else, and have complete control over the design of your site.

UPDATE: These features have been released.