One of the many good thinga about a rutorrent seedbox is that it has many more options in comparison to most of the other torrent clients out there.
By default your seedbox comes with the oblivion Theme
To change the Theme you have to click on the settings and on initial screen itself the theme option will show up:
You can click on the drop down and select the theme you like and click ok.
For Reference you can see below How rutorrent seedbox looks with different themes.
3. Acid Theme rutorrent
4. Agent46 Rutorrent Seedbox Theme
5.Blue There rutorrent Seedbox
6. Dark Theme rutorrent Seedbox
7. Excel Theme rutorrent Seedbox