Webmin now has a new theme called 'Authentic'. It looks really good, is pleasant on the eye so what is there not to like about this?
In a word, slow.
it's slower than a pig in treacle. I really like the look of this theme but the response times from my server when trying to perform simple actions via Webmin are simply too slow to be acceptable.
I've switched now to one of my 'old' favourites which was designed by Swell Technologies. You should be able to find it on the tinterweb as a .wbt file but if you have any trouble, I've uploaded it to my server - it's around 3Mb in size.