Choose Your Own Theme
I enabled an option that allows site users to select their own theme from a set of "approved" themes. One of the themes will be the site default theme. You can customize your viewing theme by clicking My Account -> Edit and then scrolling down and selecting a theme from the list of loaded themes.
At this moment, there's only about three or four available. I've got a more, but I need to review them before activating some for user selection. I'll get to this later today, so check the comments on this post for some updated info from me.