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As of right now, your ability change the theme is limited to CSS stylesheets and some image files; you can't change the HTML output, like adding or removing menu items, without the help of a plugin.

You can choose a theme using the $config['site']['theme'] element in the config.php file. See below for details.

You can add your own theme by making a sub-directory of the 'theme' subdirectory with the name of your theme. Each theme can have the following files:

display.css: a CSS2 file for "default" styling for all browsers. logo.png: a logo image for the site. default-avatar-profile.png: a 96x96 pixel image to use as the avatar for users who don't upload their own. default-avatar-stream.png: Ditto, but 48x48. For streams of notices. default-avatar-mini.png: Ditto ditto, but 24x24. For subscriptions listing on profile pages.

You may want to start by copying the files from the default theme to your own directory.