Welcome to TinyPortal.
Since this thing with us supporting Bloc's free themes is new here, we have not yet had a chance to install the themes anywhere yet in a demo format so that you can see what they look like. However, the Team will talk about what to do about that and see what we can do.
In the meantime, you can download the available themes from our download area and install them onto a test site of your own so that you can see what they look like. Sorry that we don't yet have a demo of them up yet.