Thanks for the reply, Joe.
I understand that I can do a lot of customization via the widget customization.
However, if I want to change the design, such as the background, the footer, the top user bar, etc..., then I think I should make a copy of the Evolution2 theme and then customize it, right?
This was the MO for previous versions, at least.
I've tried to do the same in this latest version, using an adaptation of what's posted here (http://docs.communityserver.com/advanced-themes/creating-new-themes/), but no luck.
My theme doesn't seem to load, even if selected in the Control Panel for site, blog and groups.
Any ideas on how to create a custom theme and make it work?