I just bumped up to 6.2 and could not find a way to do this effectively.
Here is what I found.
You can have as many css styles as you like and folks can load them as they choose - you can have only ONE Template setup.
Thus - when you choose to allow the css styles which are really harsh against your chosen Icons it's better to delete the .css styles which are that dramatic and just not allow anyone to choose them right now.
I suspect that in a future release we will be able to associate new Templates into the mix along with the css styles, too.
Regards,
Brett Harris
Infopop Corporation