This is the default homepage for b2evolution. It will be displayed as long as you don't select a default blog in the general settings. ( Edit config )
Please note: the above list (as well as the menu) is automatically generated and includes only the blogs that have a "stub url name". You can set this in the blog configuration in the back-office.
Please note: those demos do not make use of evoSkins, even if you enabled them during install. The only way to change their look and feel is to edit their PHP template. But once, again, remember these are just demos destined to inspire you for your own templates ;)