The XenLayer Virtualmin theme is based on the original Virtualmin Framed Theme, with some light modifications to colors and buttons to give it a more modern look and feel. It works as a standalone Webmin and Usermin theme as well (install separately).
Thanks, I’ve re-uploaded a new version where virtual-server-theme as been replaced by xenlayer-theme - it should now work without problems even if the default Virtualmin Framed Theme is not installed.