After a long search and waiting for a Virtualmin Theme, I decided to contribute to the community and develop a Virtualmin Theme. The name is Finally. I think that everybody will know the reason.
You can test and download Finally Virtualmin Theme at: www.luizlopes.com/virtualmin
It still a work in progress. So you will find some bugs. But they are just visual bugs (some links appear with a button style).
Feel free to write suggestions, critics and comments. And, if you find any bugs, report here on the forum or in my email (on the theme website).
I hope you enjoy it!