Here's a screenshot of the new upcoming roundcube skin we will be releasing soon. It's called LiteCube, designed for Roundcube 0.4-stable. It's a clean, simple and easy to use GUI. You can view screenshots and get updates here:
Roundcubeskins.net
It will be free for personal use and we will be offering support and upgrade packages for those that need it.
This will be a supported and maintained by
NutsMail. We have different designs in production which "LiteCube" is our first release.
We're shooting to have it ready by the end of August. If you're interested in Beta testing the skin just leave a reply here or PM me.
I hope you enjoy it.