One of the first themes verified for 2.4 is Zebra by Danny Wahl which features some nice configuration options. Zebra has configurable colors, layouts, logos and more. Authenticated users see their profile in the top right as an added aesthetic (and security) feature.
- Read more at https://moodle.org/mod/forum/discuss.php?d=217191
- Check out the demo site at http://moodle.iyware.com
- Download the plugin at https://moodle.org/plugins/view.php?plugin=theme_zebra