BootWHMCS is a WHMCS theme written from scratch to include and follow the awesome standards set by Bootstrap.
Using the latest version of Bootstrap and Font Awesome, then BootWHMCS provides an extremely simple and easy way to get started with your new WHMCS theme.
Changelog: http://bootwhmcs.com/changelog
Upload the folder "bootwhmcs" to the WHMCS templates folder and activate it under "General Settings"..
Voila!
BootWHMCS can be found at http://bootwhmcs.com/ and is regularly maintained by QuadHost.